All Patents in class 318/250


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All Patents in class 318/250
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	649,972	May 22, 1900	T.S. Watson	Electric-motor-controlling device
	1,227,400	May 22, 1917	M. von Dolivo-Dobrowolsky	Electric motor