Patents for Derby Bit Co.


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Patents for Derby Bit Co.
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	155,333	Sep. 22, 1874	W.L. Parmelee	Improvement in expansion-bits
	260,497	Jul. 04, 1882	W.L. Parmelee	Improvements in Expansion-Bits
	281,920	Jul. 24, 1883	W.L. Parmelee	Bit-stock