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All Patents in class 144/28.72
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
230,338	Jul. 20, 1880	H.C. Rice	Pencil-sharpener	pencil sharpeners
236,119	Dec. 28, 1880	H. Van Houser	Pencil-sharpening machine	pencil sharpeners
317,550	May 12, 1885	W.H. Lamson	Pencil-sharpening machine	pencil sharpeners

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