CN109278448A - Scribing line and range unit - Google Patents
Scribing line and range unit Download PDFInfo
- Publication number
- CN109278448A CN109278448A CN201811215075.6A CN201811215075A CN109278448A CN 109278448 A CN109278448 A CN 109278448A CN 201811215075 A CN201811215075 A CN 201811215075A CN 109278448 A CN109278448 A CN 109278448A
- Authority
- CN
- China
- Prior art keywords
- wall
- ruler
- scribing line
- side outer
- range unit
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tape Measures (AREA)
Abstract
The invention discloses a kind of scribing line and range units, including scribing line range unit main body, ruler, angle scale, rotary ruler, tape measure component, sliding scribing line component and chalk clamp assemblies, the side of the scribing line range unit main body is provided with ruler, angle scale is fixedly welded on one end outer wall of the ruler, the side of the angle scale is provided with rotary ruler, first rotating shaft is fixedly welded on one end side outer wall of the rotary ruler, first rotating shaft is corresponded at the side outer wall center of the angle scale and offers shaft hole, and the first rotating shaft is in shaft hole；Length, angle etc. can be carried out to kind of a combination, it is more convenient in ruler and angle scale conjunction measuring fast to can be carried out one-handed performance, it is Chong Die by the rotation and ruler of rotary ruler, realize the folding of device, convenient for storing and carrying, it can be measured by tape measure when measuring some longer objects, avoid the problem larger by ruler multistage measurement error.
Description
Technical field
The present invention relates to mappings, teaching equipment technical field, specially a kind of scribing line and range unit.
Background technique
With the development and progress of society, people often need during engineering construction is surveyed and drawn and is imparted knowledge to students through various rulers
Ranging is crossed or carried out to son, to obtain the figure and location information of reflection ground status, and can more intuitive mode
It imparts knowledge to students.
Ruler is essential tool in mapping and teaching process, often passes through ruler in mapping and teaching process at present
Carry out with bevel protractor with the use of ranging and cross, but 1, it is more numb when being used cooperatively by ruler and bevel protractor
It is tired to be unfavorable for carrying out one-handed performance, and carry also more inconvenience；2, the limited length of ruler, when measuring some longer objects
Multistage is needed to measure, and error is larger；3, round and circular arc ability is drawn without auxiliary, it cannot be accurate when drawing round and circular arc
It is succinct to determine radius, 4, be not provided with chalk clamp assemblies, cannot by clamping chalk, by rotate or move ruler carry out it is auxiliary
Help scribing line.
Summary of the invention
The purpose of the present invention is to provide scribing line and range units, to solve the problems mentioned in the above background technology.
In order to solve the above technical problem, the present invention provides following technical solutions: scribing line and range unit, including scribing line are surveyed
Away from apparatus main body, ruler, angle scale, rotary ruler, tape measure component, sliding scribing line component, chalk clamp assemblies, first rotating shaft, turn
The side of axis hole, placing groove, limited block and alignment line, the scribing line range unit main body is provided with ruler, and the one of the ruler
Angle scale is fixedly welded on the outer wall of end, and the side of the angle scale is provided with rotary ruler, outside one end side of the rotary ruler
It is fixedly welded with first rotating shaft on wall, corresponds to first rotating shaft at the side outer wall center of the angle scale and offers shaft hole, institute
First rotating shaft is stated in shaft hole, and offers placing groove on one end inner wall of shaft hole, one end position of the first rotating shaft
Limited block is provided at placing groove, one end of the ruler is internally provided with tape measure component；
The tape measure component includes the second shaft, clockwork spring, winding disc, tape measure, through hole, locating piece, mating groove, the first bullet
One end inside of spring and briquetting, the ruler is hollow structure, is provided with the second shaft on one end side inner wall of the ruler,
The outside of second shaft is rotatably connected to winding disc, and the gap location of second shaft and winding disc is provided with clockwork spring bullet
Spring, fixation is wound with tape measure on the outer wall of the winding disc, and what one end of the tape measure was opened up from the outer wall of ruler side passes through
Hole is pierced by, and one end that the tape measure is located at outside ruler is provided with locating piece, and the ruler is located on the inner wall above through hole
Mating groove is offered, the first spring is welded on the top inner wall of the mating groove, the mating groove is internally located at the first bullet
Briquetting is provided with below spring, one end of the briquetting is in contact through mating groove with the side outer wall of tape measure, the rotary ruler
Side outer wall on be provided with sliding scribing line component；
The sliding scribing line component includes mobile through slot, movable block, sliding block and sliding slot, is opened up on the side outer wall of the rotary ruler
There is mobile through slot, the mobile through slot is internally provided with movable block, is welded with sliding block on the two sides outer wall of the movable block, institute
It states and corresponds to sliding block on the two sides outer wall of mobile through slot and offer sliding slot, chalk clamping is provided on the side outer wall of the movable block
Component；
The chalk clamp assemblies include placing through-hole, mounting groove, second spring, pushing block, push rod and clamp arm, the movable block
Side outer wall center at offer placement through-hole, the movable block, which is located on the two sides inner wall for placing through-hole, offers installation
Slot is welded with second spring on the side inner wall of the mounting groove, and the side for being internally located at second spring of the mounting groove is set
It is equipped with pushing block, push rod is welded on the side outer wall of the pushing block, one end of the push rod is solid through the outside of mounting groove
Surely it is welded with clamp arm.
According to the above technical scheme, the rotary ruler is located at the side on the bottom end side outer wall of mobile through slot with movable block
Alignment line is provided on outer wall.
According to the above technical scheme, handle is welded on the side outer wall of the briquetting, on the side outer wall of the ruler
Corresponding handle is offered across slot.
According to the above technical scheme, between the sliding block and sliding slot are the component that is slidably matched, and sliding block and sliding slot are close
Gap cooperation.
According to the above technical scheme, length scale line, the angle are provided on the side outer wall of the ruler and rotary ruler
Angle index line is provided on the side outer wall of scale.
According to the above technical scheme, the number of the clamp arm is two, and the shape of clamp arm is semicircle.
According to the above technical scheme, the briquetting and mating groove and pushing block and mounting groove are the component that is slidably matched.
According to the above technical scheme, the side outer wall of one end of the clockwork spring and the second shaft welds, the clockwork spring
The other end of spring and the inner wall side of winding disc are welded.
Compared with prior art, the beneficial effects obtained by the present invention are as follows being: the invention can carry out length, angle etc. to kind
Combination, it is more convenient in ruler and angle scale conjunction measuring fast to can be carried out one-handed performance, by the rotation of rotary ruler with directly
Ruler overlapping, realizes the folding of device, convenient for storage and carries, can be surveyed by tape measure when measuring some longer objects
Amount, avoids the problem larger by ruler multistage measurement error；There is the ability of secondary scribe, keeps the straight line drawn more straight, energy
It accurately carries out drawing circular arc and circle, is provided with chalk clamp assemblies, reduces the number that user contacts with chalk, certain journey
The user protected on degree, user can flexibly using a variety of measurements of progress and draw.
Detailed description of the invention
Fig. 1 is entirety perspective view of the invention；
Fig. 2 is angle scale of the present invention and rotary ruler attachment structure schematic diagram；
Fig. 3 is the inside cutting structural schematic diagram of tape measure component of the present invention；
Fig. 4 is the local cutting structural schematic diagram of present invention sliding scribing line component；
Fig. 5 is the inside cutting structural schematic diagram of chalk clamp assemblies of the present invention；
Fig. 6 is the structural schematic diagram of the amplification of a-quadrant of the present invention；
Fig. 7 is the structural schematic diagram of the amplification of B area of the present invention；
In figure: 1, range unit main body of crossing；2, ruler；3, angle scale；4, rotary ruler；5, tape measure component；6, scribing line group is slided
Part；7, chalk clamp assemblies；8, first rotating shaft；9, shaft hole；10, placing groove；11, limited block；12, alignment line；51, second turn
Axis；52, clockwork spring；53, winding disc；54, tape measure；55, through hole；56, locating piece；57, mating groove；58, the first spring；
59, briquetting；61, mobile through slot；62, movable block；63, sliding block；64, sliding slot；71, through-hole is placed；72, mounting groove；73, the second bullet
Spring；74, pushing block；75, push rod；76, clamp arm；C, handle；D, slot is passed through.
Specific embodiment
Fig. 1-7 is please referred to, the present invention provides a kind of technical solution: scribing line and range unit, including scribing line range unit master
Body 1, angle scale 3, rotary ruler 4, tape measure component 5, sliding scribing line component 6, chalk clamp assemblies 7, first rotating shaft 8, turns ruler 2
The side of axis hole 9, placing groove 10, limited block 11 and alignment line 12, scribing line range unit main body 1 is provided with ruler 2, ruler 2
Angle scale 3 is fixedly welded on the outer wall of one end, the side of angle scale 3 is provided with rotary ruler 4, one end side outer wall of rotary ruler 4
On be fixedly welded with first rotating shaft 8, first rotating shaft 8 is corresponded at the side outer wall center of angle scale 3 and offers shaft hole 9, first
Shaft 8 offers placing groove 10 in shaft hole 9 on one end inner wall of shaft hole 9, one end of first rotating shaft 8, which is located at, puts
It sets and is provided with limited block 11 at slot 10, one end of ruler 2 is internally provided with tape measure component 5；Tape measure component 5 includes the second shaft
51, clockwork spring 52, winding disc 53, tape measure 54, through hole 55, locating piece 56, mating groove 57, the first spring 58 and briquetting 59,
It is hollow structure inside one end of ruler 2, is provided with the second shaft 51 on one end side inner wall of ruler 2, the second shaft 51
Outside is rotatably connected to winding disc 53, and the second shaft 51 and the gap location of winding disc 53 are provided with clockwork spring 52, winding disc 53
Outer wall on fixation be wound with tape measure 54, the through hole 55 that one end of tape measure 54 is opened up from 2 side outer wall of ruler is pierced by, tape measure
54 one end for being located at outside ruler 2 are provided with locating piece 56, and ruler 2, which is located on the inner wall of 55 top of through hole, offers mating groove
57, the first spring 58 is welded on the top inner wall of mating groove 57, and the lower section for being internally located at the first spring 58 of mating groove 57 is set
It is equipped with briquetting 59, one end of briquetting 59 is in contact through mating groove 57 with the side outer wall of tape measure 54, the side outer wall of rotary ruler 4
On be provided with sliding scribing line component 6；Sliding scribing line component 6 includes mobile through slot 61, movable block 62, sliding block 63 and sliding slot 64, is turned
Offering mobile through slot 61 on the side outer wall of dynamic ruler 4, mobile through slot 61 is internally provided with movable block 62, and the two of movable block 62
It is welded with sliding block 63 on the outer wall of side, corresponds to sliding block 63 on the two sides outer wall of mobile through slot 61 and offers sliding slot 64, movable block 62
Chalk clamp assemblies 7 are provided on the outer wall of side；Chalk clamp assemblies 7 include placing through-hole 71, mounting groove 72, second spring
73, pushing block 74, push rod 75 and clamp arm 76 offer at the side outer wall center of movable block 62 and place through-hole 71, movable block 62
Mounting groove 72 is offered on the two sides inner wall for placing through-hole 71, is welded with second spring on the side inner wall of mounting groove 72
73, the side for being internally located at second spring 73 of mounting groove 72 is provided with pushing block 74, welds on the side outer wall of pushing block 74
There is push rod 75, one end of push rod 75 is fixedly welded with clamp arm 76 through the outside of mounting groove 72；Rotary ruler 4 is located at mobile through slot 61
Bottom end side outer wall on and movable block 62 side outer wall on be provided with alignment line 12, by alignment line 12 cooperate ruler on
Graduation mark measures the angle of the rotation of rotary ruler 4 and the distance that movable block 62 is mobile；It is welded on the side outer wall of briquetting 59
Handle C corresponds to handle C on the side outer wall of ruler 2 and offers across slot D, by pushing handle C passing through in slot D to moving up
It is dynamic, contact briquetting 59 with tape measure 54, pull out tape measure 54, by unclamp handle C make briquetting 59 compress tape measure 54 into
Row locking；Sliding block 63 and sliding slot 64 are the component that is slidably matched, and sliding block 63 and sliding slot 64 are close clearance fit, make movable block
62 move in mobile through slot 61, are determined by the movement of movable block 62 and draw the radius that circular arc makes, and carry out when measurement pair
Quasi- effect is close clearance fit, so that movable block 62 is realized locking under frictional force effect, movable block 62 oneself is avoided to slide
Cause error；It is provided with length scale line on the side outer wall of ruler 2 and rotary ruler 4, is provided on the side outer wall of angle scale 3
Angle index line, is measured by graduation mark, and alignment when scribing line；The number of clamp arm 76 is two, and the shape of clamp arm 76
Shape is semicircle, carries out clamping chalk by clamp arm 76, agrees with clamp arm 76 with chalk outer profile by semi-circular design, make
It clamps more stable；Briquetting 59 and mating groove 57 and pushing block 74 and mounting groove 72 are the component that is slidably matched, by between them
Be used cooperatively, be conducive to scribing line and range unit preferably operate；The side of one end of clockwork spring 52 and the second shaft 51
Outer wall welding, the other end of clockwork spring 52 and the inner wall side of winding disc 53 are welded；By the effect in clockwork spring 52, make
The tape measure 54 of pull-out recycles automatically；Mathematics scribing line and range unit, can carry out the line measurement on basis by ruler 2, turn
Dynamic ruler 4 is rotatablely connected with angle scale 3 by first rotating shaft 8, by using the side of rotary ruler 4 as indicator, passes through rotation
Rotary ruler 4 carries out simple angle measurement by compare with the scale of angle disk 3, is measuring some longer objects
When part, the pull-out of tape measure 54 is measured by locating piece 56, the rotation of winding disc 53 is driven to make to send out while tape measure 54 pulls out
Bar spring 52 is unfolded, and under 52 elastic reaction of clockwork spring, unclamps locating piece 56, moves up handle C, tape measure 54 can be received automatically
It returns, is used for next time, by the effect of the first spring 58 in mating groove 57, briquetting 59 is made to press tape measure 54, it can band by handle C
Dynamic pressure block 59 moves up, and move freely tape measure 54, can be with real-time perfoming when measuring after pulling out tape measure 54 by the design
Locking facilitates reading to measure；By filling in chalk between the clamp arm 76 placed in through-hole 71, clamp arm 76 is the in mounting groove 72
Under the resiliency urged of two springs 73, chalk is made to be fixedly clamped, then by the drive chalk of movable block 62 is in mobile through slot 61
Lower movement can carry out drafting straight line, by the position-limiting action of mobile through slot 61, make the linear vertical drawn, draw circular arc or
Bowlder can cooperate graduation mark to carry out the radius for being directed at determining circular arc, pass through rotation by mobile movable block 62 by alignment line 12
Rotary ruler 4 drives chalk rotation, carries out alignment control by the graduation mark on the 12 fit angle disk 3 of alignment line of 4 bottom end of rotary ruler
The angle that rotary ruler 4 processed rotates, to make the circular arc standard drawn, mathematics scribing line and range unit can pass through ruler 2, angle
Scale 3 and rotary ruler 4 etc. are flexibly used cooperatively, and can be carried out to kind of an operation, and the above operation does not limit mathematics and crosses and ranging
The purposes of device, user can flexibly using a variety of measurements of progress and draw；Mathematics scribing line and range unit can carry out
Length, angle etc. to kind combine, it is more convenient in 3 conjunction measuring of ruler 2 and angle scale fast to can be carried out one-handed performance, pass through
The rotation of rotary ruler 4 is Chong Die with ruler 2, realizes the folding of device, convenient for storage and carries, and is measuring some longer objects
When can be measured by tape measure 54, avoid the problem larger by 2 multistage measurement error of ruler；There is the energy of secondary scribe
Power keeps the straight line drawn more straight, can accurately carry out drawing circular arc and circle, be provided with chalk clamp assemblies 7, reduce user
The number contacted with chalk, the user protected to a certain extent, user can flexibly using a variety of measurements of progress and draw.
Claims (9)
1. scribing line and range unit, including scribing line range unit main body (1), tape measure component (5), sliding scribing line component (6) and powder
Clamp assemblies (7), it is characterised in that: the side of scribing line range unit main body (1) is provided with ruler (2), the ruler
(2) it being fixedly welded on one end outer wall angle scale (3), the side of the angle scale (3) is provided with rotary ruler (4), and described turn
It is fixedly welded with first rotating shaft (8) on one end side outer wall of dynamic ruler (4), at the side outer wall center of the angle scale (3) pair
First rotating shaft (8) is answered to offer shaft hole (9), the first rotating shaft (8) is in shaft hole (9), and one end of shaft hole (9)
It being offered on inner wall placing groove (10), one end of the first rotating shaft (8), which is located at placing groove (10), is provided with limited block (11),
One end of the ruler (2) is internally provided with tape measure component (5).
2. scribing line according to claim 1 and range unit, it is characterised in that: the tape measure component (5) includes second turn
Axis (51), clockwork spring (52), winding disc (53), tape measure (54), through hole (55), locating piece (56), mating groove (57), first
One end inside of spring (58) and briquetting (59), the ruler (2) is hollow structure, one end side inner wall of the ruler (2)
On be provided with the second shaft (51), the outside of second shaft (51) is rotatably connected to winding disc (53), second shaft
(51) it is provided with clockwork spring (52) with the gap location of winding disc (53), fixation is wound with volume on the outer wall of the winding disc (53)
Ruler (54), the through hole (55) that one end of the tape measure (54) is opened up from the outer wall of ruler (2) side are pierced by, the tape measure (54)
One end external positioned at ruler (2) is provided with locating piece (56), and the ruler (2), which is located on the inner wall above through hole (55), opens
Equipped with mating groove (57), it is welded with the first spring (58) on the top inner wall of the mating groove (57), the mating groove (57)
It is internally located at below the first spring (58) and is provided with briquetting (59), one end of the briquetting (59) is through mating groove (57) and volume
The side outer wall of ruler (54) is in contact, and sliding scribing line component (6) is provided on the side outer wall of the rotary ruler (4)；
Sliding scribing line component (6) includes moving through slot (61), movable block (62), sliding block (63) and sliding slot (64), and described turn
It being offered mobile through slot (61) on the side outer wall of dynamic ruler (4), the mobile through slot (61) is internally provided with movable block (62),
It is welded with sliding block (63) on the two sides outer wall of the movable block (62), corresponds to sliding block on the two sides outer wall of the mobile through slot (61)
(63) it offers sliding slot (64), is provided with chalk clamp assemblies (7) on the side outer wall of the movable block (62)；
The chalk clamp assemblies (7) include placing through-hole (71), mounting groove (72), second spring (73), pushing block (74), pushing away
Bar (75) and clamp arm (76) offer at the side outer wall center of the movable block (62) and place through-hole (71), the movable block
(62) it is located on the two sides inner wall for placing through-hole (71) and offers mounting groove (72), on the side inner wall of the mounting groove (72)
It is welded with second spring (73), the side for being internally located at second spring (73) of the mounting groove (72) is provided with pushing block
(74), it is welded with push rod (75) on the side outer wall of the pushing block (74), mounting groove is run through in one end of the push rod (75)
(72) outside is fixedly welded with clamp arm (76).
3. scribing line according to claim 1 and range unit, it is characterised in that: the rotary ruler (4) is located at mobile through slot
(61) on bottom end side outer wall and alignment line (12) are provided on the side outer wall of movable block (62).
4. scribing line according to claim 1 and range unit, it is characterised in that: welded on the side outer wall of the briquetting (59)
It is connected to handle (C), corresponds to handle (C) on the side outer wall of the ruler (2) and offer across slot (D).
5. scribing line according to claim 1 and range unit, it is characterised in that: the sliding block (63) is to slide with sliding slot (64)
Dynamic mating component, and sliding block (63) and sliding slot (64) they are close clearance fit.
6. scribing line according to claim 1 and range unit, it is characterised in that: the one of the ruler (2) and rotary ruler (4)
It is provided with length scale line on the outer wall of side, is provided with angle index line on the side outer wall of the angle scale (3).
7. scribing line according to claim 1 and range unit, it is characterised in that: the number of the clamp arm (76) is two,
And the shape of clamp arm (76) is semicircle.
8. scribing line according to claim 1 and range unit, it is characterised in that: the briquetting (59) and mating groove (57) with
Pushing block (74) and mounting groove (72) are the component that is slidably matched.
9. scribing line according to claim 1 and range unit, it is characterised in that: one end of the clockwork spring (52) and the
The side outer wall of two shafts (51) welds, and the other end of the clockwork spring (52) and the inner wall side of winding disc (53) are welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811215075.6A CN109278448A (en) | 2018-10-18 | 2018-10-18 | Scribing line and range unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811215075.6A CN109278448A (en) | 2018-10-18 | 2018-10-18 | Scribing line and range unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109278448A true CN109278448A (en) | 2019-01-29 |
Family
ID=65176700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811215075.6A Pending CN109278448A (en) | 2018-10-18 | 2018-10-18 | Scribing line and range unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109278448A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057268A (en) * | 2019-06-13 | 2019-07-26 | 安徽理工大学 | A kind of civil engineering measuring scale |
| CN110579162A (en) * | 2019-10-11 | 2019-12-17 | 中船黄埔文冲船舶有限公司 | Detection tool for detecting bending radius of cable |
| CN111959159A (en) * | 2020-08-17 | 2020-11-20 | 莱芜职业技术学院 | Improved mathematics teaching aid |
| CN112082457A (en) * | 2020-09-10 | 2020-12-15 | 兰州交通大学 | Automatic marking device |
| CN114543623A (en) * | 2022-04-20 | 2022-05-27 | 成都理工大学 | Engineering management uses multi-functional measuring tool |
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| CN206812663U (en) * | 2017-01-22 | 2017-12-29 | 马鞍山师范高等专科学校 | A kind of teaching chalk clamper |
| CN207140622U (en) * | 2017-05-26 | 2018-03-27 | 王航 | A kind of special extensible Multifunctional ruler of Art Design |
| CN207825791U (en) * | 2016-12-24 | 2018-09-07 | 张庆明 | A kind of Multifunctional drawing teaching aid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057268A (en) * | 2019-06-13 | 2019-07-26 | 安徽理工大学 | A kind of civil engineering measuring scale |
| CN110579162A (en) * | 2019-10-11 | 2019-12-17 | 中船黄埔文冲船舶有限公司 | Detection tool for detecting bending radius of cable |
| CN110579162B (en) * | 2019-10-11 | 2021-08-20 | 中船黄埔文冲船舶有限公司 | Detection tool for detecting bending radius of cable |
| CN111959159A (en) * | 2020-08-17 | 2020-11-20 | 莱芜职业技术学院 | Improved mathematics teaching aid |
| CN111959159B (en) * | 2020-08-17 | 2021-12-10 | 莱芜职业技术学院 | Improved mathematics teaching aid |
| CN112082457A (en) * | 2020-09-10 | 2020-12-15 | 兰州交通大学 | Automatic marking device |
| CN114543623A (en) * | 2022-04-20 | 2022-05-27 | 成都理工大学 | Engineering management uses multi-functional measuring tool |
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Application publication date: 20190129 |