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All Patents in class 401/52
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	60,315	Dec. 04, 1866	B. Worcester	Improvement in Scale Pencils
	341,081	May 04, 1886	E. Weissenborn	Compass Attachment for Pencils
	575,671	Jan. 19, 1897	J.B. Smith, G.W. Watt	Telescoping Measuring-Rule
	1,176,141	Mar. 21, 1916	C.L. Heisler	Erasing Pencil

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