Patents for B43L 21 - Blackboard or slate-cleaning devices (5,409) |
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07/31/2002 | CN2502914Y Movable eraser |
07/24/2002 | CN2501699Y Electric dust-absorption blackboard eraser |
07/24/2002 | CN2501698Y Dust-proof dust-removing electric eraser capable of moving at all directions |
07/24/2002 | CN2501696Y Fully automatic dust-removing blackboard eraser |
07/18/2002 | US20020092106 Board wiper cleaning device |
07/17/2002 | CN2500490Y Dust absorpting blackboard |
07/17/2002 | CN1359339A An apparatus and a method for automatically erasing a blackboard |
07/10/2002 | CN2499243Y New dust collection blackboard brush for teaching |
07/10/2002 | CN2499242Y Envirnment protection black board eraser |
07/03/2002 | CN2497988Y Clean water jetting blackboard eraser |
07/03/2002 | CN2497987Y Automatic duster for blackboard |
07/03/2002 | CN2497985Y Circularly liftable blackboard |
06/26/2002 | CN2496677Y Multifunctional dust-absorbing eraser |
06/26/2002 | CN2496676Y Electric dust-absorbing blackboard eraser |
06/26/2002 | CN2496675Y Dust-absorbing regular eraser |
06/26/2002 | CN2496674Y Electrostatic blackboard eraser |
06/05/2002 | CN1351935A Return type blackboard |
05/22/2002 | CN2492402Y Dust-sucking black board eraser |
05/15/2002 | CN2491253Y Dustless dry-wet combined eraser |
05/15/2002 | CN2491252Y Electrostatic eraser |
05/15/2002 | CN2491251Y Environmental protection eraser |
05/15/2002 | CN2491250Y Multifunctional eraser |
05/08/2002 | CN2489984Y High-efficient chalk dust removal eraser |
05/01/2002 | CN2488700Y Fully automatic dust absorption type blackboard |
04/17/2002 | CN2486351Y Electric dust collecting chalk brush |
04/17/2002 | CN2486350Y Static blackboard eraser |
04/17/2002 | CN2486349Y Environment protection dust-proof automatic blackboard eraser |
04/16/2002 | US6370720 Apparatus and a method for automatically erasing a blackboard |
04/10/2002 | EP1195267A2 White board eraser |
04/10/2002 | CN2485150Y Blackboard |
04/09/2002 | US6367115 White board eraser |
04/03/2002 | CN2484195Y Blowing-absorbing type dust-absorbing blackboard eraser |
04/03/2002 | CN2484194Y Blackboard eraser for environmental protection |
04/03/2002 | CN2484193Y Dust-absorbing blackboard eraser |
04/03/2002 | CN2484192Y Dust-absorbing blackboard eraser |
03/27/2002 | CN2483206Y Electric chalk-dust absorbing blackboard wiper |
03/27/2002 | CN2483205Y Dust absorbing blackboard wiper |
03/27/2002 | CN2483204Y Novel black-board wiper |
03/20/2002 | CN2482503Y Blackboard with means for automatic cleaning and absorbing the chalk dust |
03/13/2002 | CN2481532Y Dustless blackboard eraser |
02/27/2002 | EP1181156A1 An apparatus and a method for automatically erasing a blackboard |
02/27/2002 | CN2478796Y Crawler blackboard without chalk dust |
02/27/2002 | CN2478795Y Crawler eraser |
02/27/2002 | CN2478791Y Automatic dust-removing blackboard (whiteboard) |
02/20/2002 | CN2477406Y Novel dust sucking eraser |
02/20/2002 | CN2477405Y Ash collecting slot of blackboard |
02/20/2002 | CN2477404Y Eraser powder collector |
02/20/2002 | CN2477403Y Electric eraser |
02/06/2002 | CN2475575Y Dustless blackboard eraser |
02/06/2002 | CN2475574Y Electric dust-collecting blackboard eraser |
01/30/2002 | CN2474350Y Dust absorbing blackboard eraser |
01/30/2002 | CN2474349Y Convenient blackboard eraser |
01/30/2002 | CN2474347Y Multifunction blackboard eraser |
01/30/2002 | CN2474344Y Multifunction fully automatic environmental protection blackboard |
01/23/2002 | CN2472975Y Dust suction blackboard eraser |
01/23/2002 | CN2472974Y Clean blackboard eraser |
01/23/2002 | CN2472973Y Automatic erasing device for blackboard |
01/23/2002 | CN2472972Y Blackboard eraser |
01/23/2002 | CN2472971Y Dustless chalk brush |
01/23/2002 | CN2472970Y Full automatic blackboard eraser for teaching |
01/16/2002 | CN2471563Y Dust collecting blackboard eraser |
01/16/2002 | CN2471562Y Dust collecting blackboard eraser |
01/16/2002 | CN2471561Y Dust-eliminating eraser |
01/16/2002 | CN2471560Y Automatic dust-collecting eraser |
01/16/2002 | CN2471559Y Blackboard eraser |
01/16/2002 | CN2471552Y Automatic blackboard |
01/09/2002 | CN2470139Y Blackboard eraser |
01/09/2002 | CN2470138Y Writing-board eraser |
01/09/2002 | CN2470137Y Hand-protection blackboard brush |
01/09/2002 | CN2470136Y Dust-free blackboard eraser |
01/02/2002 | CN2468764Y Self chalk dust suction black-board eraser |
01/02/2002 | CN2468763Y Environmental protection type chalk-dust suction black-board eraser |
01/02/2002 | CN2468762Y Self chalk dust absorbing type black board wiper |
01/02/2002 | CN2468752Y Rotary and self-cleaning and non-chalk dust type black board |
01/02/2002 | CN2468751Y Automatic water cleaning and anti reflection type black board |
12/19/2001 | CN2465955Y Dust-suction blackboard eraser |
12/19/2001 | CN2465954Y Dust-collecting blackboard eraser |
12/19/2001 | CN2465953Y Dust-collecting blackboard eraser |
12/19/2001 | CN2465952Y Electric chalk dust-less blackboard |
12/19/2001 | CN1327400A Surface treating device |
12/18/2001 | US6330732 Dust collect device for an eraser |
12/12/2001 | CN2464554Y 盒式黑板擦 Cassette eraser |
12/12/2001 | CN2464553Y Slide blackboard |
12/05/2001 | CN2463185Y Dust-collecting eraser |
12/05/2001 | CN2463182Y Circular belt type blackboard |
12/05/2001 | CN2463181Y New blackboard |
11/28/2001 | CN2461784Y Chalk powder eraser/sucker |
11/28/2001 | CN2461783Y Novel teacher's pointer eraser |
11/28/2001 | CN2461778Y Electric dustless blackboard |
11/21/2001 | CN2460329Y Eraser with chalk dust absorbing device |
11/21/2001 | CN2460328Y Chalk-dust absorbing type eraser |
11/21/2001 | CN2460327Y Eraser with chalk dust absorbing device |
11/21/2001 | CN2460326Y Eraser |
11/21/2001 | CN2460325Y Eraser |
11/21/2001 | CN2460324Y Dust-proof eraser |
11/21/2001 | CN2460318Y blackboard with dust remover |
11/14/2001 | CN2459185Y Improved blackboard erasing machine |
11/14/2001 | CN2459181Y Fully automatic blackboard |
11/07/2001 | CN2458172Y Blackboard wiper |
10/31/2001 | EP1148997A1 Creativity center apparatus and method of use |