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All Patents in class 451/475
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	1,925,709	Sep. 05, 1933	H.W. Zimmerman	Cylinder grinding tool
	1,957,485	May 08, 1934	H.W. Zimmerman	Cylinder grinding tool adjusting mechanism
	1,987,457	Jan. 08, 1935	H.W. Zimmerman	Cylinder grinding tool
	2,343,500	Mar. 07, 1944	W.M. Fairbairn, S.M. Burdick	Honing apparatus

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