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Patents for J. S. Birch & Co.
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
88,836	Apr. 13, 1869	J.S. Birch	Improvement in Self-Adjusting Watch-Keys	self-adjust wrenches
RE9,310	Jul. 20, 1880	J.S. Birch	Improvement in an Adjustable Holding Device and Watch-Key	self-adjust wrenches

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