All Patents in class 359/439


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All Patents in class 359/439
Patents 1 - 2 of 2
Number	Date	Patentee	Title	Type
427,022	Apr. 29, 1890	E. Weston	Electrical Measuring Instrument	electric meters
2,959,087	Nov. 08, 1960	W.P. Strickland, Jr.	Precision optical measuring device	milling machine accessories