Suiter Swantz IP takes a look back at past inventions and inventors with our Patent of the Day.  

On this day in 1939, Gordon C. Farmer was granted U.S. Patent No. 2,167,296 for an AUTOMATIC BLACKBOARD ERASER.

An excerpt from the patent states:

This invention appertains to new and useful improvements in the general art of brushing and scrubbing, and more particularly to an apparatus whereby blackboards can be cleaned in an easy and convenient manner.

The principal object of the invention is to provide an attachment for blackboards in the form of a power drive erasing apparatus which can be set in operation by the throw of a switch, thus eliminating the drudgery of manually cleaning blackboards.

Another important object of the invention is to provide an automatic apparatus of the character described, which is positive-acting in operation, and wherein the erasing elements can be conveniently replaced and the other details of the mechanism easily repaired in the event of the development of defects.

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