CN107933166A - A kind of blackboard cleaning device - Google Patents
A kind of blackboard cleaning device Download PDFInfo
- Publication number
- CN107933166A CN107933166A CN201711299170.4A CN201711299170A CN107933166A CN 107933166 A CN107933166 A CN 107933166A CN 201711299170 A CN201711299170 A CN 201711299170A CN 107933166 A CN107933166 A CN 107933166A
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- CN
- China
- Prior art keywords
- blackboard
- steam
- driving
- cleaning member
- cleaning
- 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.)
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Classifications
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- 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
- B43L21/00—Blackboard or slate cleaning devices
Landscapes
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a kind of blackboard cleaning device, belong to cleaning device field, including the fixed frame installed in blackboard on both sides, the cleaning member being provided with for cleaning blackboard surface is slided between the fixed frame, it is characterized in that, further include the driving device for driving the cleaning member to be moved back and forth between the fixed frame, the driving device includes servomotor, driving wheel, driven wheel and transmission belt, triangle drive block is fixed with the transmission belt, the drive block drives the female part positioned at the cleaning member end under servomotor driving, the hollow steam that the cleaning member includes the bar shaped wiping board for being used for blackboard wiping surface and is arranged in parallel with the wiping board sprays plate.The present invention is wiped by a driving of driving device back and forth simple in structure with the cleaning member automatic back-and-forth wiped again of steam moistening, had not only been liberated both hands but also had not been had powder dirt health is impacted, and safety and environmental protection is simple in structure, easy to operate.
Description
Technical field
The present invention relates to cleaning device field, is a kind of blackboard cleaning device specifically.
Background technology
Usually need to clean teaching equipment in teaching, such as blackboard, due to more than blackboard powder and
Easily waft everywhere, and need people it is manual wipe, powder dust can not only can be adsorbed on clothes, and to interior
Air ambient and human respiratory tract can cause to seriously affect.
Prior art discloses a kind of automatic blackboard cleaning device of Application No. CN201620263050.3, belong to teaching
Field, the cleaning device include the wiping body abutted with the blackboard surface and promote the wiping body on blackboard surface to move back
Dynamic pushing meanss, pushing meanss include motor, the first gear being arranged in the rotation axis of motor, engage with first gear
Second gear, second gear be equipped with second gear rotate shaft, pushing meanss further include the first roller, second tin roller,
The first connecting rod mechanism being rotatably connected with the first roller and the second connecting rod mechanism being rotatably connected with second tin roller, turn
Moving axis is connected with the first roller by the first belt transmission, and shaft is connected with second tin roller by the second belt transmission, and first connects
Linkage first end is rotatably connected with the first roller, first connecting rod mechanism second end and wiping body are rotatably connected, and second connects
Linkage first end is rotatably connected with second tin roller, second connecting rod mechanism second end and wiping body are rotatably connected.Existing skill
Art is complicated, only serves the effect of auto-erasing, it is impossible to blackboard desktop is cleaned well, still has many powder
Dust, seriously affects environmental and human health impacts.
The content of the invention
It is an object of the invention to provide a kind of blackboard cleaning device, solves more powder dust, mobile knot in the prior art
The technical problem of structure complexity.
The present invention is achieved through the following technical solutions：
A kind of blackboard cleaning device, including the fixed frame installed in blackboard on both sides, slide to be provided between the fixed frame and are used for
The cleaning member on blackboard surface is cleaned, further includes the driving dress for driving the cleaning member to be moved back and forth between the fixed frame
Put, the driving device includes servomotor, and the servomotor is connected with driving wheel by shaft, and the driving wheel passes through
Transmission belt is connected with driven wheel, and triangle drive block is fixed with the transmission belt, and the drive block drives in the servomotor
The dynamic lower female part driven positioned at the cleaning member end, the female part connect down including upper arm with by connector
Arm, the end of the cleaning member are fixed on the connector, and the fixed frame is equipped with parallel with the transmission belt the
One sliding slot and the second sliding slot, the upper arm and underarm stretch out the first sliding groove and the second sliding slot and are located at the transmission respectively
Above and below band, the upper arm and underarm of the servomotor driving drive block drive female part are described first
Moved back and forth in sliding slot and the second sliding slot.The servomotor is fixed on transmission by the driving of driving wheel, driven wheel and transmission belt
The drive block taken makees circumferential movement along transmission belt transmission direction, and female part upper arm and underarm are in the drive lower edge of drive block
The first sliding groove and the second sliding slot parallel direction are for linear motion.When drive block portion on the belt, drive block is transported with transmission belt
Row is when arrive the female part position, the side of drive block and the upper arm contacts side surfaces of female part and by drive block to upper arm application one
A cross force drives upper arm to be moved along transmission belt direction, while the cleaning member being connected with female part also can transverse movement therewith；
When drive block drives upper arm to be moved to above driving wheel, drive block does semi arch movement and in the biography around driving wheel center
The oblique side guiding of motion block is lower and upper arm is separated, and female part just rests on drive block and place is separated with upper arm；When drive block rotates
During the transmission belt of lower section, the oblique side of drive block will with the lower arm contact of female part and apply a cross force, drive underarm and
The cleaning member being connected with female part is along runner movement, when drive block is moved to driven wheel one end, its operation logic with actively
It is the same to take turns one end.Female part is driven cleaning member is moved along a straight line back and forth in the first sliding groove and the second sliding slot by drive block,
Reach the clean purpose of automatic back-and-forth, it is simple in structure.
Blackboard cleaning device as described above, the cleaning member include for blackboard wiping surface bar shaped wiping board and with
The hollow steam spray plate that the wiping board is arranged in parallel, the steam spray plate lower surface are equipped with some first ventholes, its upper surface
Equipped with multiple air admission holes, the steam spray plate is connected with heating unit by the steam pipeline being connected on the air inlet,
The heating devices heat, which is contained in its internal water body and forms steam and be delivered to the steam by the steam pipeline, to be sprayed
In plate.Steam is produced by heating devices heat water body, steam reaches the steam by venthole and steam pipeline and sprays plate
Interior, steam is discharged on blackboard surface by the steam in the steam spray plate by venthole, and steam carries out blackboard surface wet
Profit, then drive bar shaped wiping board and steam spray plate to blackboard surface first moisten wiping operation afterwards by the driving device.With steaming
Vapour first moisten wipe afterwards than with water erasing effect it is more preferable, the stream everywhere for avoiding water splashes, more convenient environmental protection.
Blackboard cleaning device as described above, the heating unit include be filled with water babinet and heated base, the water box
Body is movably arranged on the heated base, and the casing top that is filled with water is hinged with head cover, and the head cover is equipped with described in connection
The venthole of steam pipeline, the body side that is filled with water are provided with handle and heating lamp, and the handle is equipped with heating
Switch, attaching plug is connected with the heated base.The heated base connects power supply by attaching plug, in connection power supply
When press heater switch and make water body in the water box body that is placed on it of heated base heating, in heated condition, heating refers to
Show that lamp lights, be to compile to produce a large amount of steam when water body reaches boiling temperature, steam passes through positioned at the outlet being filled with water on babinet
Hole and the steam pipeline being connected on venthole are delivered a vapor in the steam spray plate.It is simple in structure, it is easy to operate.
Blackboard cleaning device as described above, the inner wall of the steam spray plate are equipped with a thermal insulation layer.Thermal insulation layer can be effective
The steam steam sprayed in plate keeps a stable temperature to avoid steam from being lost in by heat transfer, and avoids due to people
Scald caused by body is touched, safely and effectively.
Blackboard cleaning device as described above, the cleaning member are equipped with handle.Handle is set on cleaning member, side
Just user cleans blackboard surface by handle when some special circumstances need cleaning manually.
Blackboard cleaning device as described above, the fixed frame side, which is equipped with, to be used to start or close the servomotor
Switch.Switched by setting, switching can be controlled to the servomotor operating condition at any time, while to the cleaning section
Part present position is controlled, convenient and practical, easy to operate.
Compared with prior art, the present invention haing the following advantages and beneficial effect：
（1）By setting using drive block and female part as the driving device of main transmission parts, realize cleaning member in fixed frame
Between move back and forth with automatic-cleaning backboard surface action, it is simple in structure, it is easy to operate.
（2）By setting bar shaped wiping board to spray the matched cleaning component of plate with steam, the steam produced by heating unit leads to
Cross steam spray version to discharge on blackboard surface, blackboard surface is moistened, is wiped by bar shaped wiping board, effectively reduces powder
The generation at dirt powder end, more environmentally-friendly cleaning is simple in structure, easy to operate.
（3）One layer of thermal insulation layer of plate inner wall is sprayed by being arranged on steam, reduces the transmission of steam heat, extends steam
Preserve, and avoided human body touching injury caused by human body, securely and reliably.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is the left view of inventive drive means；
Fig. 3 is the top view of inventive drive means；
Fig. 4 is the front view of inventive drive means；
Fig. 5 is the structure diagram of the drive block of the present invention；
Fig. 6 is the structure diagram of the female part of the present invention；
Fig. 7 is that the steam of the present invention sprays the structure diagram of plate；
Fig. 8 is the structure diagram of the heating unit of the present invention.
Wherein 1- servomotors, 2- shafts, 3- driving wheels, 4- transmission belts, 5- fixed frames, 6- the first sliding grooves, 7- bar shapeds are wiped
Plate, 8- steam spray plate, 9- air admission holes, 10- steam pipelines, 11- heating units, the second ventholes of 111-, 112- head covers, 113-
Handle, 114- heater switch, 115- attaching plugs, 116- heating lamps, 117- heated bases, 12- female parts, on 121-
Arm, 122- connectors, 123- underarms, 13- drive blocks, the second sliding slots of 14-, 15- driven wheels, the first ventholes of 16-.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this.
Embodiment 1：
With reference to shown in attached drawing 1-6, the present embodiment provides a kind of blackboard cleaning device, including the fixed frame 5 installed in blackboard on both sides,
The cleaning member being provided with for cleaning blackboard surface is slided between the fixed frame 5, the driving cleaning member is further included and exists
The driving device moved back and forth between the fixed frame 5, the driving device include servomotor, and the servomotor 1 is logical
Cross shaft 2 and be connected with driving wheel 3, the driving wheel 3 is connected with driven wheel 15 by transmission belt 4, is fixed with the transmission belt 4
Triangle drive block 13, the drive block 13 are driven positioned at the recessed of the cleaning member end under the servomotor 1 driving
Shape part 12, the female part 12 include upper arm 121 and the underarm 123 connected by connector 122, the end of the cleaning member
It is fixed on the connector 122, the fixed frame 5 is equipped with the first sliding groove 6 and second sliding slot parallel with the transmission belt 4
14, the upper arm 121 and underarm 123 stretch out 6 and second sliding slot 14 of the first sliding groove and positioned at the transmission belts 4 respectively
Above and below, the servomotor 1 drives the drive block 13 to drive the upper arm 121 of the female part 12 and underarm 123 to exist
Moved back and forth in 6 and second sliding slot 14 of the first sliding groove.
Implementation principle；Triangle drive block 13 makees straight line and movement in a curve under the driving of servomotor 1 with transmission belt 4,
And drive block 13 drives female part 12 for linear motion, when drive block 13 moves along a straight line, drive block 13 drives female part
12 upper arm 121 or underarm 123 is for linear motion, when drive block 13 makees movement in a curve, drive block 13 and female part 12
Upper arm 121 or underarm 123 separate and make movement in a curve around driving wheel 3 or driven wheel 15, and linear motion and movement in a curve are formed
One back and forth.
The servomotor 1 passes through the fixed transmission on a moving belt of driving wheel 3, driven wheel 1515 and transmission belt 4 driving
Block 13 makees circumferential movement along 4 transmission direction of transmission belt, and 12 upper arm 121 of female part and underarm 123 are in the drive of drive block 13
It is lower for linear motion along the first sliding groove 6 and second sliding slot, 14 parallel directions.When drive block 13 is on 4 top of transmission belt, drive block
13 with transmission belt 4 when running to 12 position of female part, the side of drive block 13 and 121 contacts side surfaces of upper arm of female part 12
And apply a cross force to upper arm 121 by drive block 13 and drive upper arm 121 to be moved along 4 direction of transmission belt, while and female part
The cleaning member of 12 connections also can transverse movement therewith；When drive block 13 drives upper arm 121 to be moved to 3 top of driving wheel, pass
Motion block 13 does semi arch movement around 3 center of driving wheel and divides under being guided in the 13 oblique side of drive block with 121 phase of upper arm
From female part 12 just rests on drive block 13 and separates place with upper arm 121；WhenWhen drive block 13 rotates lower section transmission belt 4, drive block
13 oblique sides will contact with the underarm 123 of female part 12 and apply a cross force, drive underarm 123 and with female part 12
The cleaning member of connection is along runner movement, when drive block 13 is moved to 15 one end of driven wheel, its operation logic and driving wheel 3 one
End is the same.Driving female part 12 to make cleaning member by drive block 13, straight line is transported back and forth in 6 and second sliding slot 14 of the first sliding groove
It is dynamic, reach the clean purpose of automatic back-and-forth, it is simple in structure.
A kind of blackboard cleaning device provided in this embodiment, is set by being arranged on to slide between the fixed frame 5 of blackboard on both sides
Cleaning member is equipped with, it can be by being equipped with pulley, the mounting rail on fixed frame 5 at cleaning member both ends that it, which slides set-up mode,
Realize that cleaning member slides between fixed frame 5 in road.The embodiment is preferably equipped with flat with the transmission belt 4 on fixed frame 5
The length of both capable 6 and second sliding slots 14 of the first sliding groove, best 6 and second sliding slot 14 of the first sliding groove is consistent with blackboard length simultaneously
It is and equal with the centre distance of driving wheel 3 and driven wheel 15.And cleaning member can be the cleaning appliances such as blackboard brush, felt, clearly
The both ends of clean component are fixed with female part 12, and female part 12 is by upper arm 121 and 123 structure of underarm connected by connector 122
Into upper arm 121 and the fixed requirement of 123 shape of underarm, as long as can be with upper arm 121 when the drive block 13 makees movement in a curve
Separation, upper arm 121 and underarm 123 are separately mounted in 6 and second sliding slot 14 of the first sliding groove and stretch out, and transmission belt 4 is arranged on
Between upper arm 121 and underarm 123, radial height of the height of drive block 13 more preferably greater than upper arm 121 and underarm 123 thereon.Watch
Motor 1 is taken to drive driving wheel 3 by shaft 2 and drive drive block 13 thereon by 4 driven transmission wheel 15 of transmission belt, transmission belt 4
For linear motion and movement in a curve, drive block 13 are fixed on transmission belt 4, its fixed form can be bolted, and pass through spiral shell
Bolt is fixed on transmission belt 4, and its material is metal material, is preferably Steel material.
Embodiment 2：
On the basis of embodiment 1, with reference to shown in attached drawing 1 and Fig. 7, further, the cleaning member includes being used to wipe black
The bar shaped wiping board 7 of plate surface and the hollow steam being arranged in parallel with the wiping board spray plate 8, and 8 lower surface of steam spray plate is equipped with
Some first ventholes 16, its upper surface are equipped with multiple air admission holes 9, and the steam sprays plate 8 by being connected on the air inlet
Steam pipeline 10 be connected with heating unit 11, the heating of heating unit 11 is contained in its internal water body and forms steam and lead to
The steam pipeline 10 is crossed to be delivered in the steam spray plate 8
Implementation principle：The steam produced by heating unit 11 is transported in steam spray version, then going out by steam spray version lower surface
Stomata outwards discharges steam.
Water body is heated by heating unit 11 and produces steam, steam reaches the steaming by venthole and steam pipeline 10
In vapour spray plate 8, steam is discharged on blackboard surface by the steam in the steam spray plate 8 by venthole, and steam is to blackboard table
Face is moistened, then blackboard surface first moisten wiping afterwards by driving device driving bar shaped wiping board 7 and steam spray plate 8
Operation.First moistened with steam wipe afterwards than with water erasing effect it is more preferable, the stream everywhere for avoiding water splashes, more convenient environmental protection.
A kind of blackboard cleaning device provided in this embodiment, the bar shaped wiping board 7 are arranged in parallel with steam spray version, it is set
Mode can be by connecting rod be connected to bar shaped wiping board 7 and steam spray it is between plate 8 or solid by both both ends
Be scheduled on the female part 12 realize it is parallel, between interval be preferred less than 3cm.The bar shaped wiping board 7 is close to blackboard surface,
And interval is equipped between steam spray plate 8 and blackboard, space requirement can effectively moisten blackboard surface between 5cm-1cm
.And steam sprays plate 8 on the premise of parallel with bar shaped wiping board 7, steam spray version can have angle namely with blackboard
It is obliquely installed, can also be parallel with blackboard plane.The steam spray enterprising stomata 9 of plate 8 is uniformly distributed on it on surface, and
Steam is filled in steam by air admission hole 9 and sprays in plate 8, and first venthole 16 is evenly distributed on the lower surface of steam spray plate 8,
Steam is set effectively to be moistened to corresponding blackboard surface by the first venthole 16.The heating unit 11 is that can heat water
Body produces the device of a large amount of steam, is preferably the device of continuous heating.
Embodiment 3:
On the basis of above-described embodiment 2, with reference to shown in attached drawing 8, the heating unit includes be filled with water babinet and heated base
117, the babinet that is filled with water is movably arranged on the heated base 117, and the casing top that is filled with water is hinged with head cover 112, institute
State head cover 112 and be equipped with the second venthole 111 for connecting the steam pipeline 10, the body side that is filled with water is provided with handle
113 and heating lamp 116, the handle 113 be equipped with heater switch 114, being connected with power supply on the heated base 117 inserts
First 115.
Implementation principle：The water body heated by heated base 117 in water box body produces steam.
The heated base 117 connects power supply by attaching plug 115, and pressing heater switch 114 when connecting power supply makes
Heated base 117 heats the water body in the water box body being placed on it, and in heated condition, heating lamp 116 lights, when
Water body produces a large amount of steam when reaching boiling temperature, and continuous heating produces enough, and steam positioned at described by being filled with water on babinet
The second venthole 111 and the steam pipeline 10 that is connected on the second venthole 111 deliver a vapor to the steam spray plate 8
It is interior.It is simple in structure, it is easy to operate.
A kind of blackboard cleaning device provided in this embodiment, the principle of heating of the heating unit is continuous heating on the market
Electric or equipment it is the same, seldom lay down a definition herein.The babinet that is filled with water is movably arranged on heated base 117, its setting side
Formula make a living apply flexibly hot-water bottle activity set mode it is identical.
In order to preferably easy to use, the heating unit is being heated to produce a large amount of steam, and the driving device starts,
Complete one and clean process back and forth.
Embodiment 4：
On the basis of embodiment 2 or embodiment 3, with reference to shown in attached drawing 1, the inner wall of the steam spray plate 8 is heat-insulated equipped with one
Layer.
Implementation principle;Thermal loss caused by less heat transfer.
The heat-barrier material that the thermal insulation layer uses can be heat-reflecting material or vacuum material.
In order to preferably easy to use, handle, i.e. user are equipped with the bar shaped wiping board 7 or on steam spray plate 8
Formula can be manually can also be electronic, easy to operate, simple in structure.
A kind of blackboard cleaning device provided by the invention, side, which is equipped with, on fixed frame 5 is used to starting or closing described watch
Take the switch of motor 1.The switch is electrically connected with 1 controller of servomotor, and controls the startup of the servomotor 1
Or close, the switch is installed on the place used easy to user.
The above, is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is every according to
Any simply modification, the equivalent variations made according to the technical spirit of the present invention to above example, each fall within the protection of the present invention
Within the scope of.
Claims (6)
1. a kind of blackboard cleaning device, including the fixed frame installed in blackboard on both sides（5）, the fixed frame（5）Between slide and set
It is equipped with the cleaning member for cleaning blackboard surface, it is characterised in that further include the driving cleaning member in the fixed frame
（5）Between the driving device that moves back and forth, the driving device includes servomotor, the servomotor（1）Pass through shaft
（2）It is connected with driving wheel（3）, the driving wheel（3）Pass through transmission belt（4）It is connected with driven wheel（15）, the transmission belt（4）On
It is fixed with triangle drive block（13）, the drive block（13）In the servomotor（1）Lower drive of driving is located at the cleaning
The female part of ends（12）, the female part（12）Including upper arm（121）With pass through connector（122）The underarm of connection
（123）, the end of the cleaning member is fixed on the connector（122）On, the fixed frame（5）It is equipped with and the transmission
Band（4）Parallel the first sliding groove（6）With the second sliding slot（14）, the upper arm（121）And underarm（123）Described first is stretched out respectively
Sliding slot（6）With the second sliding slot（14）And it is located at the transmission belt（4）Above and below, the servomotor（1）Driving institute
State drive block（13）Drive the female part（12）Upper arm（121）And underarm（123）In the first sliding groove（6）Slided with second
Groove（14）Inside move back and forth.
2. blackboard cleaning device according to claim 1, it is characterised in that the cleaning member includes being used for blackboard wiping
The bar shaped wiping board on surface（7）Plate is sprayed with the hollow steam being arranged in parallel with the wiping board（8）, the steam spray plate（8）Lower surface
Equipped with some first ventholes（16）, its upper surface is equipped with multiple air admission holes（9）, the steam spray plate（8）By being connected to
State air admission hole（9）On steam pipeline（10）It is connected with heating unit（11）, the heating unit（11）Heating is contained in it
Internal water body forms steam and passes through the steam pipeline（10）It is delivered to the steam spray plate（8）In.
3. blackboard cleaning device according to claim 2, it is characterised in that the heating unit（11）Including the babinet that is filled with water
And heated base（117）, the babinet that is filled with water is movably arranged on the heated base（117）On, the casing top hinge that is filled with water
It is connected to head cover（112）, the head cover（112）It is equipped with and connects the steam pipeline（10）The second venthole（111）, it is described
The body side that is filled with water is provided with handle（113）And heating lamp（116）, the handle（113）It is equipped with heater switch
（114）, the heated base（117）On be connected with attaching plug（115）.
4. the blackboard cleaning device according to Claims 2 or 3, it is characterised in that it is characterized in that, the steam sprays plate
（8）Inner wall be equipped with a thermal insulation layer.
5. blackboard cleaning device according to claim 4, it is characterised in that the cleaning member is equipped with handle.
6. blackboard cleaning device according to claim 5, it is characterised in that the fixed frame（5）Side, which is equipped with, to be used to open
Move or close the servomotor（1）Switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711299170.4A CN107933166A (en) | 2017-12-08 | 2017-12-08 | A kind of blackboard cleaning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711299170.4A CN107933166A (en) | 2017-12-08 | 2017-12-08 | A kind of blackboard cleaning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107933166A true CN107933166A (en) | 2018-04-20 |
Family
ID=61946398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711299170.4A Pending CN107933166A (en) | 2017-12-08 | 2017-12-08 | A kind of blackboard cleaning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107933166A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112122219A (en) * | 2020-09-16 | 2020-12-25 | 淄博职业学院 | Outdoor patriotic education propaganda device |
-
2017
- 2017-12-08 CN CN201711299170.4A patent/CN107933166A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112122219A (en) * | 2020-09-16 | 2020-12-25 | 淄博职业学院 | Outdoor patriotic education propaganda device |
| CN112122219B (en) * | 2020-09-16 | 2022-04-19 | 淄博职业学院 | Outdoor propaganda device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180420 |
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| WD01 | Invention patent application deemed withdrawn after publication |