B43L 21 - Blackboard or slate-cleaning devices

Patents for B43L 21 - Blackboard or slate-cleaning devices (5,409)
12/2006
12/06/2006	CN2843896Y 黑板擦 Eraser
12/06/2006	CN2843895Y Rotary blackboard eraser
12/06/2006	CN2843888Y Easily-erasing blackboard
11/2006
11/29/2006	CN2841364Y Folding blackboard eraser
11/29/2006	CN2841363Y Dustless chalk eraser
11/22/2006	CN2838990Y Chalk dust-absorbing blackboard eraser
11/22/2006	CN2838989Y Chalk dust-absorbing blackboard eraser
11/22/2006	CN2838988Y Electric dust-absorbing blackboard eraser
11/22/2006	CN2838980Y Dustless blackboard
11/22/2006	CN2838979Y Repeatedly using drawing and writing notebook assembly
11/08/2006	CN2834939Y A water-spraying blackboard eraser
11/08/2006	CN2834938Y A blackboard eraser capable of collecting chalk dust automatically
11/08/2006	CN2834937Y Dust-absorbing blackboard eraser
11/08/2006	CN2834936Y Chalk dust absorptive blackboard eraser
11/08/2006	CN2834935Y Structure improvement of electric blackboard eraser
11/08/2006	CN2834929Y Vertical blackboard machine capable of circuiting automatically
10/2006
10/25/2006	CN2830109Y Environment protection dust suction eraser
10/25/2006	CN2830108Y Windshield wiper type eraser
10/25/2006	CN2830107Y Water type eraser
10/25/2006	CN2830106Y Visual eraser
10/25/2006	CN2830102Y Easy-to-wipe blackboard
10/24/2006	CA2352161C Creativity center apparatus and method of use
10/11/2006	CN2825318Y Chalk powder collector
10/11/2006	CN2825317Y Rotary blackboard eraser
10/11/2006	CN1843774A Rotary blackboard capable of cleaning chalk mark and preventing dust diffusion automatically
09/2006
09/27/2006	CN2820568Y Gas sealed dustless blackboard eraser
09/27/2006	CN2820567Y 无尘黑板擦 Clean eraser
09/27/2006	CN2820566Y Dust sucking blackboard brush
09/20/2006	CN2818176Y Multifunctional blackboard sponge
09/20/2006	CN2818175Y Non-electric dust collecting blackboard sponge
09/20/2006	CN2818174Y Blackboard sponge
09/13/2006	CN2815731Y Handgrip type black-white board eraser
09/13/2006	CN2815719Y Chalk writing device capable of erasing and writing
09/06/2006	CN2813331Y Chalk dust-absorbing blackboard eraser
09/06/2006	CN2813330Y Non-dust blackboard eraser
08/2006
08/30/2006	CN2811019Y Turnable track type blackboard
08/23/2006	CN2808597Y Black eraser with dust collection function
08/23/2006	CN2808596Y 滑动黑板擦 Slide eraser
08/23/2006	CN2808595Y Sanitary blackboard eraser
08/23/2006	CN2808589Y Blackboard carried with cleaning device
08/23/2006	CN1820968A Ultra-fine fiber blackboard eraser
08/23/2006	CN1820967A Blackboard eraser
08/16/2006	CN2806188Y Dust-absorbing eraser
08/16/2006	CN2806187Y Dust-absorbing blackboard eraser
08/16/2006	CN2806186Y Dust-absorbing blackboard eraser
08/16/2006	CN2806185Y Blackboard eraser
08/16/2006	CN2806184Y 雨刷式黑板擦 Wipers style eraser
08/16/2006	CN2806183Y Rolling dustproof blackboard eraser
08/16/2006	CN2806169Y 可擦写粉笔套 Erasable chalk sets
08/09/2006	CN2803759Y Folding eraser
08/09/2006	CN2803758Y Telescopic eraser
08/09/2006	CN2803757Y Electric wetting and dust sucking eraser
08/09/2006	CN2803756Y Dust sucking blackboard eraser
08/09/2006	CN2803746Y Auto dust removing blackboard
08/09/2006	CN2803745Y Blackboard
08/09/2006	CN2803743Y Multifunction blackboard
08/09/2006	CN2803730Y Multifunction teachingt aid
08/02/2006	EP1685978A2 Modular board arrangement and method of assembling the same
08/02/2006	CN2801510Y Automatic dust absorption blackboard eraser
08/02/2006	CN2801503Y Dust absorbing blackboard
08/02/2006	CN2801502Y Multifunction blackboard
08/02/2006	CN2801501Y Movable dust removing blackboard
07/2006
07/26/2006	CN2799277Y Electric blackboard eraser
07/26/2006	CN2799276Y Dust-free blackboard eraser
07/26/2006	CN2799275Y Dry-wet dust-eliminating blackboard eraser
07/19/2006	CN2797076Y Multifunction blackboard eraser
07/19/2006	CN2797075Y 黑板擦 Eraser
07/12/2006	CN2794874Y Dust absorbtiorn blackboard eraser
07/12/2006	CN2794869Y Automatic dust removing black board
07/05/2006	CN2792818Y Dust-collecting blackboard eraser
07/05/2006	CN2792817Y Dust-collecting blackboard eraser
07/05/2006	CN2792816Y Automatic roller blackboard eraser
07/05/2006	CN2792815Y 黑板擦 Eraser
06/2006
06/28/2006	CN2790796Y Electric-controlled screen-type writing device
06/28/2006	CN2790795Y Sanitary blackboard eraser
06/21/2006	CN2789049Y 黑板擦 Eraser
06/21/2006	CN2789048Y Blackboard eraser
06/14/2006	CN1785692A Manufacturing method of new type blackboard
06/07/2006	CN2785874Y Magnetic dust-eliminating blackboard
06/07/2006	CN2785873Y Environment friendly full-automatic track type multifunctional blackboard
06/07/2006	CN1781734A Dust-proof balck board brush
05/2006
05/31/2006	CN2784207Y Apparatus for cleaning chalk-written trail automatically
05/31/2006	CN1780741A Writing assembly in combination with an eraser assembly
05/24/2006	CN2782423Y Dust-suction blackboard eraser
05/24/2006	CN2782422Y Dust-suction blackboard eraser
05/17/2006	CN2780502Y Full automatic environmental protection eraser
05/17/2006	CN2780501Y Eraser cnpable of suction chalk qust
05/17/2006	CN2780500Y Cortable hand carried eraser
05/17/2006	CN2780493Y Fixed blackboard with eraser
05/10/2006	CN2778581Y Blackboard eraser
05/10/2006	CN2778580Y Automatically erasing dust-free black board
05/10/2006	CN2778412Y Automatic dry-cleaning machine for blackboard eraser
05/03/2006	CN2776703Y Dust collecting blackboard eraser
05/03/2006	CN2776697Y Writing device capable of automatic erasing out handwriting
04/2006
04/26/2006	CN2774810Y Dust-proof environment protection blackboard
04/26/2006	CN2774809Y Device for cleaning blackboard
04/26/2006	CN2774805Y Multifunction tiltable blackboard
04/26/2006	CN2774804Y Dust suction device for blackboard
04/19/2006	CN2772836Y Blackboard eraser with dust-collecting casing
04/19/2006	CN2772833Y Environmental-protective blackboard with automatic water erasing

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