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Blackboard-Cleaner.

Description: Patent for a blackboard cleaner that incorporates a "water reservoir having manually controlled means for communicating the water of the reservoir to the rubbing element of the cleaner" (lines 13-17) including an illustration. The rubbing element was also made to be easily removed for replacement or cleaning.
Date: January 29, 1918
Creator: Satrum, Gilbert G. & Snartemo, Ingvald B.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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