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Patents for Robert R. Ketchel
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	990,421	Apr. 25, 1911	G.H. Benzon, Jr.	Belt Driving Mechanism for Reciprocating Parts of Machines
	1,380,699	Jun. 07, 1921	G.H. Benzon, Jr.	Planer
	1,455,556	May 15, 1923	W.H. Thorne	Clamping Mechanism for Machine Tools

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