CN211477331U - Automatic calibration device for volume of multi-station three-equal metal measuring device - Google Patents
Automatic calibration device for volume of multi-station three-equal metal measuring device Download PDFInfo
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- CN211477331U CN211477331U CN202020499013.9U CN202020499013U CN211477331U CN 211477331 U CN211477331 U CN 211477331U CN 202020499013 U CN202020499013 U CN 202020499013U CN 211477331 U CN211477331 U CN 211477331U
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Abstract
The utility model relates to the technical field of container metering, in particular to an automatic calibration device for the volume of a multi-station three-grade metal measuring device, which comprises a water tank, a metal measuring device to be detected, a standard metal measuring device, a variable frequency water pump and a pressure stabilizing container; the standard metal measuring device is provided with a water inlet I, a water outlet I, a liquid level pipe I, a measuring neck scale I, a photoelectric liquid level control switch and an electromagnetic valve; the metal gauge to be detected is provided with a water inlet II, a water outlet II, a liquid level pipe II and a measuring neck staff gauge II; the water outlet I of the standard metal measuring device is communicated with the water inlet II of the metal measuring device to be detected, and the water outlet II of the metal measuring device to be detected is communicated with the water tank. The utility model discloses rational in infrastructure, economical and practical, the artificial interference that significantly reduces improves the inspection accuracy, reduces manual work, expense cost, can realize that many stations wait to examine the metal gauge and carry out the automatic accurate examination of volume simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the container measurement technique and specifically relates to a many steps are gone on simultaneously, liquid level photoelectric control's automatic calibration device of third class metal measuring vessel volume.
Background
The capacity measurement is a basic law control measurement work, and is related to the problems of operation management, product quality, cost accounting and the like of petrochemical, trade, traffic, civil aviation and other departments. The standard metal measuring device is an indispensable measuring device for measuring the capacity and can be divided into a first-class standard, a second-class standard and a third-class standard according to different purposes and use accuracy grades; the first two types of the standard measuring instruments are mostly used as standard measuring instruments, the third standard metal measuring instruments are mostly used as working measuring instruments, the volume measuring instruments are commonly used volume measuring instruments, and the volume measuring instruments are increasingly applied to oil product measurement and enterprise production links of petrochemical engineering, oil depots and gas stations, so that the accuracy of volume measurement is ensured; therefore, whether the metering performance is accurate or not is directly related to the calculation of the accuracy and the economic benefit of carrying out quantity value transmission. The third-class metal measuring device has large detection quantity and centralized verification period, and the quantity value tracing is mostly completed by a local provincial metrological verification mechanism. The conventional detection method is a capacity comparison method, and in the prior art, the following problems mainly exist in the detection process of the three-class metal measuring device:
(1) the accuracy is low: when water is injected into the second-class metal measuring device, the height of the liquid level in the liquid level pipe needs to be manually adjusted according to the scale value of the measuring neck scale (calibrated by the upper-level metering and calibrating mechanism) each time, a drainage valve needs to be opened and closed by hands, time is wasted, and meanwhile, the accuracy of a calibration result is influenced due to the intervention of human factors;
(2) waste of water resources: the volume calibration needs to be carried out three times according to the regulation of JJG 259-2005 standard metal measuring device calibration regulations, after the three metal measuring devices carry out primary water injection volume calibration at present, water is usually directly discharged into a sewer pipeline, and then the next volume calibration is carried out, so that the water is not recycled, and if the volume calibration of a 100L metal measuring device is at least discharged by 300L, the waste of water resources is caused;
(3) water pressure and water temperature control difficulties: the unstable water pressure brings unstable water flow, when the metal measuring device is filled with water, the metal measuring device is impacted and collided with the metal wall surface, adverse factors such as cyclone and air bubble are easily generated, the temperature correction is inaccurate due to the unstable water temperature, and uncertain factors are introduced into volume calibration;
(4) the efficiency is low: no matter a capacity weighing method or a capacity comparison method, the volume calibration of the three equal-level metal measuring devices can only be performed one by one at present, and the simultaneous volume calibration of multiple stations cannot be realized, so that the working efficiency is low, and the situations of overdue, delay and the like during the daily metrological verification work are caused.
Disclosure of Invention
An object of the utility model is to provide a rational in infrastructure, economical and practical can be according to waiting to examine the different specifications of metal measuring apparatu, at the automatic in-process of maring of metal measuring apparatu volume, the jamming that significantly reduces improves the inspection accuracy, reduces manual work, expense cost, and furtherly can realize that many stations wait to examine the metal measuring apparatu and carry out volume automatic verification simultaneously, many stations such as the high automatic calibration device of metal measuring apparatu volume.
The utility model discloses a multi-station three-equal metal measuring device volume automatic calibration device, which mainly comprises a water tank, a metal measuring device to be detected, a standard metal measuring device, a variable frequency water pump and a pressure stabilizing container;
the water inlet of the variable frequency water pump is communicated with the water tank, the water outlet of the variable frequency water pump is communicated with the pressure stabilizing container, and the pressure stabilizing container is provided with a water conveying port;
the standard metal measuring device is provided with a water inlet I, a water outlet I, a liquid level pipe I, a metering neck scale I, a photoelectric liquid level control switch and an electromagnetic valve, wherein the liquid level pipe I is arranged at the upper part of the standard metal measuring device and forms a communicating pipe structure with the lower part of the standard metal measuring device; the measuring neck staff gauge I is arranged close to the liquid level pipe I, the photoelectric liquid level control switch is arranged on the liquid level pipe I, electromagnetic valves are arranged at the water inlet I and the water outlet I of the standard metal measuring device, and the electromagnetic valves at the two positions are connected with the photoelectric liquid level control switch;
the metal measuring device to be detected is provided with a water inlet II, a water outlet II, a liquid level pipe II and a measuring neck scale II, wherein the liquid level pipe II is arranged at the upper part of the metal measuring device to be detected and forms a communicating pipe structure with the lower part of the metal measuring device to be detected; the metering neck scale II is arranged close to the liquid level pipe II, the water outlet I of the standard metal measuring device is communicated with the water inlet II of the metal measuring device to be detected, and the water outlet II of the metal measuring device to be detected is communicated with the water tank.
Preferably, the standard metal measuring device and the metal measuring device to be detected are provided with a plurality of groups, the standard metal measuring device and the metal measuring device to be detected in each group are combined into a detection group, the water inlet of the standard metal measuring device in each detection group is connected in parallel to the water conveying pipe led out from the water conveying port of the pressure stabilizing container, the water outlet of the standard metal measuring device in each detection group is communicated with the water inlet of the metal measuring device to be detected in the group, and the water outlet of the metal measuring device to be detected in each detection group is communicated with the water tank.
Preferably, the pressure stabilizing container is also provided with an overflow port and a water discharge port, and the overflow port and the water discharge port are communicated with the water tank through pipelines.
Preferably, the drain port of the metal measuring device to be detected is provided with a manual switch.
The utility model discloses can be based on examining the metal measuring vessel specification, in the laboratory, can carry out the volume to the metal measuring vessel such as one or more three of different specifications commonly used and mark.
The utility model discloses the theory of operation:
referring to example 1, preparation was carried out by placing a metal measuring device I to be tested under a standard metal measuring device I of the same specification, adjusting them to horizontal positions, respectively, inserting a drain port of the metal measuring device I to be tested into an underground water tank, and opening and closing a manual valve C1The water outlet of the standard metal measuring device I is connected into the metal measuring device I to be detected; the power-on is connected with the equipment,before the variable frequency water pump runs, the on-off of each electric valve is checked flexibly and reliably, and before water enters, each valve is in a closed state. Starting to work, opening the electromagnetic valve D1And D, starting the variable frequency water pump, checking that each pipeline interface of the device is sealed and watertight, ensuring that the pressure and the temperature of the pressure stabilizing container work normally, and when the pressure in the pressure stabilizing container rises to a set value, automatically reducing the frequency or directly closing the variable frequency water pump.
The operation is explained in detail below, and firstly, the operation of "wall wetting" is carried out, and the electromagnetic valve A is opened1Ensuring to close the electromagnetic valve B1When the liquid level in the liquid level pipe I rises to the scale value on the corresponding metering neck scale I, the photoelectric liquid level control switch is triggered, so that the electromagnetic valve A1Closing, after the standard metal gauge I fully wets the inner surface, opening the electromagnetic valve B1Ensuring closing of the valve C1Water enters the metal measuring device I to be detected from the standard metal measuring device I, the metal measuring device I to be detected fully wets the inner surface of the metal measuring device I, and then the valve C is opened1Draining water into an underground water tank to finish wall moistening operation; secondly, the operation of 'volume calibration' is carried out, and the electromagnetic valve B is closed1Opening the electromagnetic valve A1The water flow enters the standard metal measuring device I again, and when the liquid level in the liquid level pipe I rises to the scale value on the corresponding measuring neck scale I, the photoelectric liquid level control switch is triggered, so that the electromagnetic valve A1Closing the standard metal measuring device I, wherein the volume value of water in the standard metal measuring device I is larger than the nominal value (the excessive amount can be calculated), and opening the electromagnetic valve B1(the regulating valve is small opening degree and can prevent the liquid level from fluctuating), when the concave liquid level in the liquid level pipe I drops to the scale value on the corresponding metering neck scale I, the photoelectric liquid level control switch is triggered, so that the electromagnetic valve B1Closing the metal measuring device, namely, taking the volume value of water in the standard metal measuring device I as the nominal value, discharging no water drops from the water outlet of the metal measuring device I to be detected, and closing the valve C1(the valve belongs to a metal gauge I to be detected and needs manual operation), an electromagnetic valve B is opened1The water flows into the metal measuring device I to be detected from the standard metal measuring device I and is static until the liquid level in the liquid level pipe II of the metal measuring device I to be detected is stableReading the scale value on the metering neck scale II, and opening the manual valve C1Draining water to finish one volume calibration operation; and repeating the averaging for 2 times to finish the volume calibration work of the metal gauge I to be detected.
According to the working principle, the device can simultaneously carry out the same operation on other stations, the specifications of common metal measuring instruments are 100L, 50L, 20L, 10L, 5L and the like, standard metal measuring instruments are additionally arranged and are all connected in parallel on a water conveying pipe led out from a water conveying port of a pressure stabilizing container, and the device can realize the simultaneous volume automatic verification of the detected three-stage metal measuring instruments of a plurality of stations. In the operation process, the scale value on the metering neck scale is obtained according to the tracing of the standard metal measuring device, and the photoelectric liquid level control switch is fixed on the liquid level pipe. The frequency of the variable frequency water pump is changed according to the pressure in the pressure stabilizing container, so that automatic water supplement and water source pressure stabilization are realized.
Compared with the prior art, the utility model has the advantages that:
(1) the water is recycled, and the random waste of water resources is avoided;
(2) the application of the photoelectric liquid level control system can reduce human intervention and improve the accuracy of the volume value of the metal gauge to be detected;
(3) the metal measuring device to be detected directly discharges water into the underground water tank, can be recycled, and does not need to carry the metal measuring device to and fro for drainage, so that the labor cost is reduced;
(4) the pressure stabilizing container and the variable frequency water pump are applied, so that the pressure of a water source is more controllable, and meanwhile, the water source is closed, the influence of convection of ambient air on the water temperature is reduced, and the temperature becomes stable;
(5) the utility model discloses a can carry out many steps volume simultaneously and mark, degree of automation is high, has improved work efficiency.
The utility model discloses rational in infrastructure, economical and practical can be according to waiting to examine the different specifications of metal measuring apparatu, at the automatic in-process that marks of metal measuring apparatu volume, and the jamming that significantly reduces improves the inspection accuracy, reduces manual work, expense cost, and further, can realize that many stations wait to examine the metal measuring apparatu and carry out the automatic accurate examination of volume simultaneously, be the automatic calibration device of many stations third class metal measuring apparatu volume that degree of automation is high.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a magnified portion of the gauge of fig. 1.
Fig. 3 is a schematic structural view of an enlarged portion of the metal gauge to be tested in fig. 1.
Fig. 4 is a schematic structural diagram of embodiment 2 of the present invention.
Shown in the figure: 1 is water tank, 2 is frequency conversion water pump, 3 is steady voltage container, 4 is overflow mouth, 5 is water delivery port, 6 is the delivery port, 7 is water inlet I, 8 is standard metal measuring vessel I, 9 is outlet I, 10 is water inlet II, 11 is the metal measuring vessel I of being examined, 12 is outlet II, 13 is solenoid valve A 114 is a photoelectric liquid level control switch, 15 is a metering neck scale I, 16 is a liquid level pipe I, 17 is an electromagnetic valve B 118 is a measuring neck scale II, 19 is a liquid level pipe II, 20 is a manual switch C1, 21 is a standard metal measuring device II, 22 is a detected metal measuring device II, 23 is a standard metal measuring device N, and 24 is a detected metal measuring device N.
Detailed Description
Example 1:
referring to fig. 1-3, which are schematic structural views of an embodiment of the present invention, the present invention mainly includes a water tank 1, a standard metal measuring device i 8, a metal measuring device to be detected i 11, a variable frequency water pump 2, and a pressure stabilizing container 3;
the water inlet of the variable frequency water pump 2 is communicated with the water tank 1, the water outlet of the variable frequency water pump 2 is communicated with the pressure stabilizing container 3, the pressure stabilizing container 3 is provided with a water delivery port 5, an overflow port 4 and a water discharge port 6, and the overflow port 4 and the water discharge port 6 are both communicated with the water tank 1 through pipelines.
The standard metal measuring device I is provided with a water inlet I7, a water outlet I9, a liquid level pipe I16, a measuring neck scale I15, a photoelectric liquid level control switch 14 and an electromagnetic valve A 113. Electromagnetic valve B 117, the liquid level pipe I16 is arranged at the upper part of the standard metal measuring device I8 and forms a communicating pipe structure with the lower part of the standard metal measuring device I8; the metering neck scale I15 is arranged close to the liquid level pipe I16,the photoelectric liquid level control switch 14 is arranged on the liquid level pipe I16, electromagnetic valves A are respectively arranged at the water inlet I7 and the water outlet I9 of the standard metal measuring vessel I8 113. Electromagnetic valve B 117, the electromagnetic valves at two positions are connected with the photoelectric liquid level control switch 14;
the metal gauge I11 to be detected is provided with a water inlet II 10, a water outlet II 12, a liquid level pipe II 19 and a measuring neck scale II 18, wherein the liquid level pipe II 19 is arranged at the upper part of the metal gauge I11 to be detected and forms a communicating pipe structure with the lower part of the metal gauge I11 to be detected; the metering neck scale II 18 is arranged close to the liquid level pipe II 19, the water outlet I9 of the standard metal measuring device I8 is communicated with the water inlet II 10 of the metal measuring device I11 to be detected, and the water outlet II 12 of the metal measuring device I11 to be detected is communicated with the water tank 1. A manual switch C is arranged at the water outlet II 12 of the metal gauge I11 to be detected120。
The following working principle and process are detailed:
referring to FIG. 1, preparation is carried out by placing a metal gauge I8 under a standard metal gauge I11 of the same specification, adjusting them to horizontal positions, connecting a water outlet II 12 of the metal gauge I11 into an underground water tank 1, and opening and closing a manual valve C 120, ensuring that the valve is flexible and reliable, and connecting a water outlet of the standard metal measuring device I8 into the metal measuring device I11 to be detected; the connection equipment is electrified, before the variable frequency water pump runs, the on-off of each electric valve is checked flexibly and reliably, and before water enters, each valve is in a closed state. Starting to work, opening the electromagnetic valve D1And D, starting the variable frequency water pump 2, checking that each pipeline interface of the device is sealed and watertight, ensuring that the pressure and the temperature of the pressure stabilizing container 3 work normally, and when the pressure in the pressure stabilizing container 3 rises to a set value, automatically reducing the frequency or directly closing the variable frequency water pump 2.
The operation is explained in detail below, and firstly, the operation of "wall wetting" is carried out, and the electromagnetic valve A is opened1Ensuring to close the electromagnetic valve B1When the liquid level in the liquid level pipe I16 rises to the scale value on the corresponding metering neck scale I15, the photoelectric liquid level control switch 14 is triggered, so that the water flow enters the standard metal measuring device I8Electromagnetic valve A1Closing, after the standard metal gauge I8 fully wets the inner surface, opening the electromagnetic valve B1Ensuring closing of the valve C1Water enters the metal measuring device I11 to be detected from the standard metal measuring device I8, the metal measuring device I8 to be detected fully wets the inner surface, and then the valve C is opened1Draining water into the underground water tank 1 to finish wall moistening operation; secondly, the operation of 'volume calibration' is carried out, and the electromagnetic valve B is closed1Opening the electromagnetic valve A1The water flow enters the standard metal measuring device I8 again, and when the liquid level in the liquid level pipe I16 rises to the scale value on the corresponding measuring neck scale I15, the photoelectric liquid level control switch 14 is triggered, so that the electromagnetic valve A1Closing the standard metal measuring device I8 when the volume value of water in the standard metal measuring device I8 is larger than the nominal value (the excessive amount can be calculated), and opening the electromagnetic valve B1(the regulating valve is small opening degree and can prevent the liquid level from fluctuating), when the concave liquid level in the liquid level pipe I16 drops to the scale value on the corresponding metering neck scale I15, the photoelectric liquid level control switch 14 is triggered, so that the electromagnetic valve B1Closing the valve C, taking the volume value of the water in the standard metal measuring device I8 as the nominal value, discharging water drops through a water outlet of the metal measuring device I11 to be detected, and closing the valve C1(the valve belongs to a metal gauge I to be detected and needs manual operation), an electromagnetic valve B is opened1The water flows into the metal measuring device I11 to be detected from the standard metal measuring device I8, stands until the liquid level in the liquid level pipe II 19 of the metal measuring device I11 to be detected is stable, reads the scale value on the measuring neck scale II 18, and opens the manual valve C1Draining water to finish one volume calibration operation; and repeating the averaging for 2 times to finish the volume calibration work of the metal gauge I11 to be detected.
Example 2:
referring to fig. 4, compared with example 1, there are differences in that:
the standard metal measuring device and the metal measuring device to be detected in the present embodiment are provided with a plurality of groups, for example, a first group of standard metal measuring device and metal measuring device to be detected, which are named as a standard metal measuring device i 8 and a metal measuring device i 11 to be detected, a second group of standard metal measuring device and metal measuring device to be detected, which are named as a standard metal measuring device ii 21 and a metal measuring device ii 22 to be detected, and so on, and an nth group of standard metal measuring device and metal measuring device to be detected, which are named as a standard metal measuring device N23 and a metal measuring device to be detected N24.
The standard metal measuring devices and the metal measuring devices to be detected of each group are combined into a detection group, the water inlets of the standard metal measuring devices in each detection group are connected in parallel to a water conveying pipe led out from a water conveying port 5 of the pressure stabilizing container, the water outlets of the standard metal measuring devices in each detection group are communicated with the water inlets of the metal measuring devices to be detected in the group, and the water outlets of the metal measuring devices to be detected in each detection group are communicated with the water tank 1. The water tank is arranged underground.
The standard metal measuring devices in each group are respectively provided with a water inlet, a water outlet, a liquid level pipe, a measuring neck scale, a photoelectric liquid level control switch 14, an electromagnetic valve A and an electromagnetic valve B, wherein the electromagnetic valves A and B are respectively arranged at the water inlet and the water outlet of the standard metal measuring devices and are respectively connected with the photoelectric liquid level control switch 14. For example, the electromagnetic valves A are respectively arranged at the water inlet and the water outlet of the standard metal measuring device II 21 of the group 22And B2And electromagnetic valves An and Bn are respectively arranged at the water inlet and the water outlet of the N-th group of the standard metal measuring device N24.
The metal gauge to be detected in each group is provided with a water inlet, a water outlet, a liquid level pipe and a measuring neck scale.
Referring to the working principle mentioned in embodiment 1, this embodiment can simultaneously perform operation verification on the metal measuring devices to be tested on a plurality of stations, and the specifications of common metal measuring devices include 100L, 50L, 20L, 10L, 5L, and the like. A plurality of standard metal measuring instruments are additionally arranged and are all connected in parallel on a water conveying pipe led out from a water conveying port 5 of the pressure stabilizing container 3, so that automatic volume verification of a plurality of metal measuring instruments to be detected in three stages can be realized. In the operation process, a scale value on the metering neck scale is obtained according to the tracing of the standard metal measuring device, and the photoelectric liquid level control switch is fixed on a liquid level pipe of the standard metal measuring device; the frequency of the variable frequency water pump is changed according to the pressure in the pressure stabilizing container, so that automatic water supplement and water source pressure stabilization are realized. In the embodiment, the application of the photoelectric liquid level control system is utilized, so that the human intervention is greatly reduced, and the accuracy of the volume value of the metal gauge to be detected is improved; the pressure stabilizing container and the variable frequency water pump are applied, so that the pressure of a water source is more controllable, and meanwhile, the water source is closed, the influence of convection of ambient air on the water temperature is reduced, and the temperature becomes stable; the volume calibration device can simultaneously carry out multi-station volume calibration, has high automation degree and improves the working efficiency.
Claims (5)
1. The automatic calibration device for the volume of the multi-station three-equal metal measuring device is characterized by mainly comprising a water tank, a metal measuring device to be detected, a standard metal measuring device, a variable frequency water pump and a pressure stabilizing container;
the water inlet of the variable frequency water pump is communicated with the water tank, the water outlet of the variable frequency water pump is communicated with the pressure stabilizing container, and the pressure stabilizing container is provided with a water conveying port;
the standard metal measuring device is provided with a water inlet I, a water outlet I, a liquid level pipe I, a metering neck scale I, a photoelectric liquid level control switch and an electromagnetic valve, wherein the liquid level pipe I is arranged at the upper part of the standard metal measuring device and forms a communicating pipe structure with the lower part of the standard metal measuring device; the measuring neck staff gauge I is arranged close to the liquid level pipe I, the photoelectric liquid level control switch is arranged on the liquid level pipe I, electromagnetic valves are arranged at the water inlet I and the water outlet I of the standard metal measuring device, and the electromagnetic valves at the two positions are connected with the photoelectric liquid level control switch;
the metal measuring device to be detected is provided with a water inlet II, a water outlet II, a liquid level pipe II and a measuring neck scale II, wherein the liquid level pipe II is arranged at the upper part of the metal measuring device to be detected and forms a communicating pipe structure with the lower part of the metal measuring device to be detected; the metering neck scale II is arranged close to the liquid level pipe II, the water outlet I of the standard metal measuring device is communicated with the water inlet II of the metal measuring device to be detected, and the water outlet II of the metal measuring device to be detected is communicated with the water tank.
2. The automatic calibration device for the volume of the multi-station three-equal metal measuring device according to claim 1, wherein the standard metal measuring device and the metal measuring device to be tested are provided with a plurality of groups, the standard metal measuring device and the metal measuring device to be tested in each group are configured into a test group, the water inlet of the standard metal measuring device in each test group is connected in parallel to the water pipe led out from the water pipe of the pressure stabilizing container, the water outlet of the standard metal measuring device in each test group is communicated with the water inlet of the metal measuring device to be tested in the group, and the water outlet of the metal measuring device to be tested in each test group is communicated with the water tank.
3. The automatic calibrating device for the volume of the multi-station three-equal metal measuring device according to claim 1 or 2, wherein the pressure stabilizing container is further provided with an overflow port and a water discharge port, and the overflow port and the water discharge port are both communicated with the water tank through pipelines.
4. The automatic calibrating device for the volume of a multi-station three-equal metal measuring device as claimed in claim 1 or 2, wherein a manual switch is arranged at the water outlet of the metal measuring device to be tested.
5. The automatic calibrating apparatus for the volume of a multi-station three-level metal measuring device as claimed in claim 3, wherein the drain outlet of the metal measuring device to be tested is provided with a manual switch.
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| CN202020499013.9U CN211477331U (en) | 2020-04-08 | 2020-04-08 | Automatic calibration device for volume of multi-station three-equal metal measuring device |
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| CN202020499013.9U CN211477331U (en) | 2020-04-08 | 2020-04-08 | Automatic calibration device for volume of multi-station three-equal metal measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514122B (en) * | 2021-05-28 | 2024-04-26 | 新疆维吾尔自治区计量测试研究院 | Capacity comparison method and measuring method verification system for metal gauge |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514122B (en) * | 2021-05-28 | 2024-04-26 | 新疆维吾尔自治区计量测试研究院 | Capacity comparison method and measuring method verification system for metal gauge |
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Granted publication date: 20200911 Termination date: 20210408 |