All Patents in class D19/64


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All Patents in class D19/64
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	3,097,435	Jul. 16, 1963	H. Goldschmidt	Self testing device
	3,230,642	Jan. 25, 1966	H. Goldschmidt	Teaching and testing apparatus