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All Patents in class 359/449
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	2,222,165	Nov. 19, 1940	R.R. Finn, R.O. Beardsley	Comparator
	2,525,596	Oct. 10, 1950	R.R. Finn	Optical Projection Screen

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