CN210178079U - Gas film coal shed with non-stop bucket wheel machine - Google Patents
Gas film coal shed with non-stop bucket wheel machine Download PDFInfo
- Publication number
- CN210178079U CN210178079U CN201920737367.XU CN201920737367U CN210178079U CN 210178079 U CN210178079 U CN 210178079U CN 201920737367 U CN201920737367 U CN 201920737367U CN 210178079 U CN210178079 U CN 210178079U
- Authority
- CN
- China
- Prior art keywords
- film coal
- bucket wheel
- shed
- coal shed
- wheel machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Chain Conveyers (AREA)
Abstract
The utility model provides an air film coal shed of a bucket wheel machine without shutdown, which relates to the technical field of air film building and comprises a plurality of air film coal sheds, wherein a separation wall is arranged between two adjacent air film coal sheds; a first channel for the bucket wheel machine to pass through is arranged on the isolation wall, and the width of the first channel is larger than that of the bucket wheel machine; the first channel is used for communicating the air film coal sheds positioned on the two sides of the partition wall; the end of the first channel is provided with a first seal for closing the first channel. The technical effect that the bucket wheel machine does not stop is achieved.
Description
Technical Field
The utility model relates to a gas film building technical field particularly, relates to the gas film coal canopy that bucket wheel machine does not shut down.
Background
The air-supported membrane structure is one of inflatable membrane structures, and a pressure control system is used for inflating the building to ensure that a certain pressure difference is kept indoors and outdoors, so that the covering membrane body is subjected to an upper buoyancy force and generates a certain pre-tension stress to ensure the rigidity of the system. The air-supported membrane structure building is a newly developed form in building structures, and takes a fabric with excellent performance as a material, and supports a membrane surface by air pressure, so that a structural system which has certain rigidity and can cover a large-span space is formed. The gas film totally-enclosed coal storage shed is a novel totally-enclosed building type coal storage shed which is applied to coal storage and transfer operation and meets the requirement of environmental protection on coal pile closure. Because of the unique structure of no beam, no column and no rigid support, the gas film totally-enclosed coal storage shed can really realize the totally-enclosed coal yard, is energy-saving and environment-friendly, and is convenient to build and dismantle. After the gas film coal shed is installed, the bucket wheel machine works, and the totally-enclosed environment greatly improves the external environment.
However, when the existing gas film coal shed building is constructed in a coal yard with a bucket wheel machine, the bucket wheel machine must be shut down for 20-60 days, and a series of work such as film material field installation, splicing, gas film inflation and the like is required on a construction site, so that the working efficiency is reduced.
Therefore, it is an important technical problem to be solved by those skilled in the art to provide a gas film coal shed with a bucket wheel machine which can work normally without shutdown.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a gas film coal canopy of bucket wheel machine not shutting down to the technical problem who builds gas film coal canopy bucket wheel machine and need shut down among the prior art is alleviated.
The embodiment of the utility model provides an air film coal shed with a bucket wheel machine not stopping, which comprises a plurality of air film coal sheds, and a separation wall is arranged between every two adjacent air film coal sheds;
a first channel for the bucket wheel machine to pass through is arranged on the isolation wall, and the width of the first channel is larger than that of the bucket wheel machine; the first channel is used for communicating the air film coal sheds on two sides of the partition wall;
the end of the first channel is provided with a first seal for closing the first channel.
The embodiment of the utility model provides a first possible implementation mode, wherein, the quantity of above-mentioned air film coal canopy is two, including first air film coal canopy and second air film coal canopy.
The embodiment of the present invention provides a second possible implementation manner, wherein a plurality of second channels for passing the coal pusher are provided on the partition wall;
the end of the second channel is provided with a second seal for closing the second channel.
The embodiment of the utility model provides a third possible implementation mode, wherein, the longitudinal section of above-mentioned division wall is the T type, just one side of division wall with first air film coal canopy butt, the opposite side with second air film coal canopy butt.
The embodiment of the utility model provides a fourth possible implementation mode, wherein, the gas film coal canopy that above-mentioned bucket wheel machine did not shut down still includes the first conveyer belt that is used for outwards transporting coal, first conveyer belt is located first gas film coal canopy with in the second gas film coal canopy, just first conveyer belt passes through first passageway.
The embodiment of the utility model provides a fifth possible implementation mode, wherein, the gas film coal canopy that above-mentioned bucket wheel machine did not shut down still includes the second conveyer belt that is used for outwards transporting coal, the second conveyer belt is located first gas film coal canopy with in the second gas film coal canopy, just the second conveyer belt passes through first passageway.
The embodiment of the present invention provides a sixth possible implementation manner, wherein the distance between the first conveyor belt and the second conveyor belt is greater than the working diameter of the bucket wheel machine.
The embodiment of the utility model provides a seventh possible implementation mode, wherein, above-mentioned first air film coal canopy with second air film coal canopy both all are provided with revolving door and the emergency exit that supplies the personnel to pass in and out.
The embodiment of the utility model provides an eighth possible implementation, wherein, above-mentioned first air film coal canopy with second air film coal canopy both all are provided with the emergency door that supplies the personnel to pass in and out.
The embodiment of the utility model provides a ninth possible implementation mode, wherein, above-mentioned first air film coal canopy with second air film coal canopy edge between them all is provided with the vehicle access who supplies the vehicle loading and unloading coal.
Has the advantages that:
the embodiment of the utility model provides an air film coal shed of a bucket wheel machine without shutdown, which comprises a plurality of air film coal sheds, wherein a separation wall is arranged between two adjacent air film coal sheds; a first channel for the bucket wheel machine to pass through is arranged on the isolation wall, and the width of the first channel is larger than that of the bucket wheel machine; the first channel is used for communicating the air film coal sheds positioned on the two sides of the partition wall; the end of the first channel is provided with a first seal for closing the first channel.
During operation, firstly dividing an open-air coal pile into a first area and a second area, then arranging a bucket wheel machine in the first area to normally work, then building an air film coal shed in the second area by workers, building an isolation wall, driving the bucket wheel machine into a first channel in the isolation wall after the building is finished, sealing the built air film coal shed and the first channel, then inflating the built air film coal shed, and then continuing to normally work in the built air film coal shed by the bucket wheel machine; and the staff continues to build the air film coal shed in the first area, and when the construction of the air film coal shed in the first area is completed, the air film coal shed in the first area is inflated, and the air film coal sheds in the first coal shed and the second coal shed are communicated. Through such setting for the bucket wheel machine can normally work in the construction process of gas film coal canopy, and does not influence the normal construction work of gas film coal canopy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic overall structure diagram of an air film coal shed with a bucket wheel machine not stopped according to an embodiment of the present invention;
FIG. 2 is a schematic view of a portion of the connection of a first air film coal shed to a second air film coal shed in the cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic view of a portion of the connection between the first and second air film coal booths in the cross-sectional view of B-B of FIG. 1;
fig. 4 is a schematic view of a gas film coal shed with a bucket wheel machine not stopped according to an embodiment of the present invention (gas film not shown).
Icon:
100-a first air-film coal shed; 200-a second air film coal shed;
300-a partition wall; 310-a first channel; 320-a second channel;
410-a first conveyor belt; 420-a second conveyor belt; 500-bucket wheel machine;
610-a revolving door; 620-emergency gate; 630-vehicle aisle.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
Referring to fig. 1-4, an embodiment of the present invention provides an air film coal shed of a bucket wheel machine without shutdown, which includes a plurality of air film coal sheds, and a partition wall 300 is disposed between two adjacent air film coal sheds; the partition wall 300 is provided with a first passage 310 for the bucket wheel machine 500 to pass through, and the width of the first passage 310 is greater than that of the bucket wheel machine 500; the first passage 310 communicates the air film coal sheds located at both sides of the partition wall 300; the end of the first channel 310 is provided with a first seal for closing the first channel 310.
During operation, firstly dividing an open-air coal pile into a first area and a second area, then arranging a bucket wheel machine in the first area to normally work, then building an air film coal shed in the second area by workers, building a partition wall 300, driving the bucket wheel machine 500 into a first channel 310 in the partition wall 300 after the building is finished, sealing the built air film coal shed and the first channel 310, then inflating the built air film coal shed, and then continuing to normally work in the built air film coal shed by the bucket wheel machine 500; and the staff continues to build the air film coal shed in the first area, and when the construction of the air film coal shed in the first area is completed, the air film coal shed in the first area is inflated, and the air film coal sheds in the first coal shed and the second coal shed are communicated. Through such setting for the bucket wheel machine can normally work in the construction process of gas film coal canopy, and does not influence the normal construction work of gas film coal canopy.
In an alternative of this embodiment, the air film coal shed comprises a first air film coal shed 100 and a second air film coal shed 200; one side of the partition wall 300 is connected to the first air film coal shed 100, and the other side is connected to the second air film coal shed 200.
The first passage 310 is arranged, so that the problem that the bucket wheel machine 500 cannot enter the second air film coal shed 200 due to the fact that no storage space exists in the uninflated second air film coal shed 200 can be avoided. The first duct 310 is provided so that the bucket wheel machine 500 can enter the second air film coal shed 200 before the second air film coal shed 200 is not inflated, and after the second air film coal shed 200 is restarted, the bucket wheel machine 500 can be driven into the second air film coal shed 200 from the first duct 310 without the bucket wheel machine 500 entering the second air film coal shed 200 from the outside of the second air film coal shed 200.
It should be noted that the bucket wheel machine 500 has a large volume, and if the bucket wheel machine 500 is driven into the second air film coal shed 200 after the second air film coal shed 200 is inflated, other dangerous accidents are easily caused by excessive gas leakage from the second air film coal shed 200.
It should be further noted that when the bucket wheel machine 500 drives into the first passage 310, the sharp part of the bucket wheel machine 500 is wrapped by the staff, so as to avoid the sharp part of the bucket wheel machine 500 from damaging the air film. Wherein, the sharp part of the bucket wheel machine 500 can be wrapped by flexible materials such as sponge.
Wherein, the end of the first channel 310 is provided with a sealing member, the first channel 310 is sealed by the sealing member, so as to ensure that the constructed air film coal shed does not leak air from the first channel 310, and the bucket wheel machine 500 can smoothly drive into the constructed air film coal shed by stopping in the first channel 310. For example, when the first air film coal shed 100 is first constructed, the end of the first passageway 310 remote from the first air film coal shed 100 is provided with a seal; when the second air film coal shed 200 is first constructed, the end of the first passageway 310 remote from the second air film coal shed 200 is provided with a seal.
Specifically, the bucket wheel machine 500 can smoothly drive into the first passage 310, and the width of the first passage 310 is greater than the maximum width of the bucket wheel machine 500, so as to ensure that the bucket wheel machine 500 can drive into the first passage 310.
The first sealing element can adopt a sealing door or a sealing film.
In an alternative of this embodiment, the partition wall 300 is provided with a plurality of second passages 320 through which the coal pusher passes.
During operation, the coal pusher can conveniently reciprocate between the first air film coal shed 100 and the second air film coal shed 200 through the second through hole formed in the separation wall 300.
In an alternative of this embodiment, the second channel 320 is provided with a second seal at the end for closing the second channel 320.
The second channel 320 is provided with a second sealing member, which may be a sealing door or a sealing film.
Referring to fig. 2 to 3, in an alternative embodiment, the partition wall 300 has a T-shaped longitudinal section, and one side of the partition wall 300 abuts against the first air film coal shed 100 and the other side abuts against the second air film coal shed 200.
In particular, the arrangement of the partition wall 300 can greatly simplify the drainage and snow removal work at the joint of the first and second air film coal booths 100 and 200. When rain and snow are accumulated on the partition wall 300, the first air film coal shed 100 and the second air film coal shed 200 are not pressed, and the operator can clearly see the air film coal shed.
The longitudinal section of the partition wall 300 is a vertical section of the partition wall 300 along the extending direction of the first conveyor 410.
Referring to fig. 4, in an alternative embodiment of the present embodiment, the air film coal shed in which the bucket wheel machine is not stopped further includes a first conveyor belt 410 for transporting coal to the outside, the first conveyor belt 410 is located in the first air film coal shed 100 and the second air film coal shed 200, and the first conveyor belt 410 can pass through the first passage 310.
The first conveyor belts 410 are arranged in the first air film coal shed 100 and the second air film coal shed 200, and the first conveyor belts 410 in the first air film coal shed and the second air film coal shed can be of an integrated structure or spliced together.
The first conveyor belt 410 is connected with a conveyor belt outside the air film coal shed; in operation, the bucket wheel 500 transfers coal in the air film coal shed to the first conveyor belt 410, and then transports the coal out of the air film coal shed through the first conveyor belt 410 and transports the coal to an external conveyor belt.
In an alternative of this embodiment, the gas film coal shed in which the bucket wheel machine does not stop includes a second conveyor belt 420 for transporting coal outward, the second conveyor belt 420 being located in the first gas film coal shed 100 and the second gas film coal shed 200, and the second conveyor belt 420 being capable of passing through the first passage 310.
The first air film coal shed 100 and the second air film coal shed 200 are internally provided with second conveyor belts 420, and the second conveyor belts 420 in the first air film coal shed and the second air film coal shed can be of an integrated structure or spliced together.
The second conveyor belt 420 is connected with the conveyor belt outside the air film coal shed; in operation, the bucket wheel 500 transfers the coal in the air film coal shed to the second conveyor belt 420, and then transports the coal out of the air film coal shed through the second conveyor belt 420 and transports the coal to an external conveyor belt.
Referring to fig. 4, in an alternative embodiment, the distance between the first conveyor 410 and the second conveyor 420 is greater than the working diameter of the bucket wheel machine 500.
When two bucket wheel machines 500 are arranged in the air film coal shed, the first conveyor belt 410 and the second conveyor belt 420 are matched with one bucket wheel machine 500, and the distance between the first conveyor belt 410 and the second conveyor belt 420 is larger than the working diameter of the bucket wheel machine 500, so that when the two bucket wheel machines 500 are simultaneously positioned in the same air film coal shed to work, the two bucket wheel machines 500 cannot collide with each other.
Referring to fig. 1 and 4, in an alternative of the present embodiment, both the first and second air film coal booths 100 and 200 are provided with a revolving door 610 and an emergency door 620 for personnel to enter and exit.
Staff can pass in and out the first air film coal shed 100 or the second air film coal shed 200 through the revolving door 610, and when an emergency situation is met, the staff can pass in and out the first air film coal shed 100 or the second air film coal shed 200 through the emergency door 620.
Referring to fig. 1 and 4, in an alternative of the present embodiment, both the first air film coal shed 100 and the second air film coal shed 200 are provided with a car passage 630 for loading and unloading coal for vehicles.
The vehicle enters the interior of both the first air film coal shed 100 and the second air film coal shed 200 through the automobile passage 630 for coal unloading.
The working method of the gas film coal shed with the bucket wheel machine not stopped comprises the following steps of dividing an open-air coal pile into a first area and a second area, wherein the first area is used for building the first gas film coal shed 100, and the second area is used for building the second gas film coal shed 200; the bucket wheel machine 500 is arranged in the area of the first air film coal shed 100 for normal operation; constructing a second air film coal shed 200, and constructing a partition wall 300 and a first passage 310; after the second air film coal shed 200 is constructed, driving the bucket wheel machine 500 into the first passage 310, and closing the second air film coal shed 200 and the first passage 310; inflating the second air film coal shed 200; constructing a first air film coal shed 100, and inflating the first air film coal shed 100 after the construction is finished; the first air film coal shed 100 and the second air film coal shed 200 are communicated.
By the working method, the downtime of the bucket wheel machine 500 can be greatly reduced, and the bucket wheel machine 500 can work normally when workers construct the first air film coal shed 100 and the second air film coal shed 200. Only after the first gas film coal shed is built, when the bucket wheel machine 500 needs to enter the first channel 310 and inflate the built gas film coal shed, the bucket wheel machine 500 needs to be shut down for 1-2 days, and compared with the prior art in which the bucket wheel machine 500 is shut down for 20-60 days, various losses caused by shutdown of the bucket wheel machine 500 are greatly reduced.
It should be noted that, in the actual working process, the sequence of the first air film coal shed 100 and the second air film coal shed 200 can be adjusted arbitrarily according to the actual situation.
It should be noted that, when the first constructed air film coal shed is inflated, the bucket wheel machine 500 needs to be driven into the first passage 310 and the outlet of the first passage 310 needs to be sealed, so as to avoid air leakage from the outlet of the first passage 310 when the air film coal shed is inflated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An air film coal shed with a bucket wheel machine not stopped is characterized by comprising: the system comprises a plurality of air film coal sheds, wherein a separation wall (300) is arranged between every two adjacent air film coal sheds;
a first channel (310) for the bucket wheel machine (500) to pass through is arranged on the separation wall (300), and the width of the first channel (310) is larger than that of the bucket wheel machine (500); the first channel (310) communicates the air film coal shed on both sides of the partition wall (300);
the end of the first channel (310) is provided with a first seal for closing the first channel (310).
2. The gas film coal shed with no bucket wheel machine shutdown as claimed in claim 1, wherein the number of the gas film coal shed is two, and the gas film coal shed comprises a first gas film coal shed (100) and a second gas film coal shed (200).
3. The air film coal shed with the bucket wheel machine not stopped as claimed in claim 2, characterized in that a plurality of second channels (320) for passing coal pushers are arranged on the separation wall (300);
the end of the second channel (320) is provided with a second seal for closing the second channel (320).
4. The gas film coal shed with the non-shutdown bucket wheel machine as claimed in claim 2, characterized in that the longitudinal section of the separation wall (300) is T-shaped, and one side of the separation wall (300) is abutted with the first gas film coal shed (100) and the other side is abutted with the second gas film coal shed (200).
5. The gas film coal shed with no bucket wheel machine downtime of claim 2, further comprising a first conveyor belt (410) for transporting coal outward, the first conveyor belt (410) being located within the first gas film coal shed (100) and the second gas film coal shed (200), and the first conveyor belt (410) passing through the first channel (310).
6. The gas film coal shed with no bucket wheel machine downtime as claimed in claim 5, further comprising a second conveyor belt (420) for transporting coal outward, the second conveyor belt (420) being located within the first gas film coal shed (100) and the second gas film coal shed (200), and the second conveyor belt (420) passing through the first passage (310).
7. The gas film coal shed with no bucket wheel machine shutdown as claimed in claim 6, wherein the distance between the first conveyor belt (410) and the second conveyor belt (420) is greater than the working diameter of the bucket wheel machine (500).
8. The gas film coal shed with no bucket wheel machine shut-down of any one of claims 2 to 7, characterized in that both the first gas film coal shed (100) and the second gas film coal shed (200) are provided with a revolving door (610) for personnel to enter and exit.
9. The gas film coal shed with no bucket wheel machine downtime of any one of claims 2 to 7, wherein both the first gas film coal shed (100) and the second gas film coal shed (200) are provided with emergency doors (620) for personnel to enter and exit.
10. The air film coal shed with the bucket wheel machine not stopped as claimed in any one of claims 2 to 7, characterized in that the edges of the first air film coal shed (100) and the second air film coal shed (200) are provided with automobile channels (630) for loading and unloading coal for vehicles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920737367.XU CN210178079U (en) | 2019-05-22 | 2019-05-22 | Gas film coal shed with non-stop bucket wheel machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920737367.XU CN210178079U (en) | 2019-05-22 | 2019-05-22 | Gas film coal shed with non-stop bucket wheel machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210178079U true CN210178079U (en) | 2020-03-24 |
Family
ID=69834280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920737367.XU Active CN210178079U (en) | 2019-05-22 | 2019-05-22 | Gas film coal shed with non-stop bucket wheel machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210178079U (en) |
-
2019
- 2019-05-22 CN CN201920737367.XU patent/CN210178079U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101130807B1 (en) | Vacuum sectional management system and vacuum blocking screen device for the tube railway | |
| CN1918346B (en) | Expandable container | |
| CN109723484B (en) | Closed pressure drainage combined ventilation system and ventilation method for tunnel construction by drilling and blasting method | |
| KR101023419B1 (en) | Special vehicle having container extendable inner space | |
| CN210178079U (en) | Gas film coal shed with non-stop bucket wheel machine | |
| CN112814042B (en) | Flexible waterproof curtain capable of quickly separating diffusion of site polluted underground water | |
| KR20200027575A (en) | Self-reinflating tire | |
| WO2024016533A1 (en) | General steel sleeve structure of multi-specification shield machine and use method thereof | |
| CN110017055B (en) | Air film coal shed with non-stop bucket wheel machine and working method thereof | |
| CN103086095B (en) | Systemfor powder transportation | |
| CN104373597B (en) | A kind of inflatable seal bar | |
| KR20200126382A (en) | Empty Tube Transport System Tube | |
| CN217949871U (en) | Portable medical science nucleic acid testing laboratory of inflatable | |
| CN104533510A (en) | Tunnel gas discharging system | |
| CN110777979B (en) | Electric vertical folding lifting partition | |
| CN113089879B (en) | Sandwich color steel plate convenient to mount | |
| CN101785661B (en) | Container-type medical examination box | |
| KR20200112849A (en) | Tubes and tube segments for empty tube transport systems | |
| CN109083294A (en) | A kind of positive-pressure closing structural concrete wall device channels gas check and method | |
| CN103569595B (en) | Belt conveyor inside trestle corridor of air structure sealing arrangement | |
| CN210719579U (en) | Device for detecting air tightness of engineering on site door | |
| CN101284608A (en) | Entry lock system, web processing installation, and method for using the same | |
| CN112377145A (en) | Pressure control equipment with leaking stoppage structure and implementation method thereof | |
| CN108560717B (en) | Air-supported multilayer film building structure | |
| FI128880B (en) | A drainage system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |