All Patents in class 427/474


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All Patents in class 427/474
Patents 1 - 5 of 5
Picture	Number	Date	Patentee	Title
	1,854,071	Apr. 12, 1932	E.C. Schacht	Method of manufacturing abrasives
	2,027,307	Jan. 07, 1936	E.C. Schacht	Method of coating and apparatus therefor and product
	2,082,182	Jun. 01, 1937	E.C. Schacht	Manufacture of abrasive articles
	RE20,660	Feb. 22, 1938	E.C. Schacht	Method of coating and apparatus therefor and product
	2,245,301	Jun. 10, 1941	E.C. Schacht	Manufacture of abrasive articles