B - Operations – Transporting – 43 – L
Patent
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.
290411
Agnesi Ray
Bond Damion
Agnesi Ray
Bond Damion
LandOfFree
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