Electronic way to rapidly erase a blackboard

Details Electronic way to rapidly erase a blackboard Electronic way to rapidly erase a blackboard

B - Operations, Transporting

43

L

15/15

B43L 21/00 (2006.01)

Patent

CA 1059272

ABSTRACT. The advantages offered by the invention hereby applied for and enti- tled "An electronic way to rapidly erase a black-board" are the fol- lowing; 1)-It makes it possible to erase a blck-board mechanically instead of manually, which implies a considerable saving of time for the per- son who is using it and... 2)- It represents a large saving of funds for the School, Commission, University, Institution etc, which presently must hire a special staff whose duty is to make the turn of all the class rooms, in order to erase, at the end of each school day, all the black-boards.

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