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Patents for William M. Porter
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	230,514	Jul. 27, 1880	A.A. Wilder	Safety-governor for elevators, &c.
	248,539	Oct. 18, 1881	A.A. Wilder	Safety attachment and governor for elevators
	250,367	Dec. 06, 1881	I. Kinney	Wrench & Pipe Cutter

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