Patent Model - Slate-Cleaner
Maker and role
Louis Halbert, Patentee
Oct 12 1880
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2 x 2 1/2 x 2 1/2" (5.1 x 6.4 x 6.4cm)
The objective of Halbert's patent "is to furnish slate and glass cleaners which shall be simple in construction and convenient and effective in use, and which will contain water to be applied to the article to be cleaned, as may be required." (Patent Number 233,238)
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