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Patents for I. D. Walker
Patents 1 - 3 of 3
Number	Date	Patentee	Title	Type
407,842	Jul. 30, 1889	A. Schuermann	Tool-driver	spiral screwdrivers
422,520	Mar. 04, 1890	O.Z. Greene	Screw-driver	spiral screwdrivers
510,994	Dec. 19, 1893	T. Schafer	Extensible Measuring Stick	special purpose gauges

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