All Patents in class 356/391


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All Patents in class 356/391
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	2,035,780	Mar. 31, 1936	R.R. Finn, E.T. Bysshe, R.O. Beardsley	Comparator
	2,484,103	Oct. 11, 1949	R.E. Lewis	Projection Comparator for Objects in Relation to Spaced Drawings or Reticles
	2,521,820	Sep. 12, 1950	L.B. Fuller, R.O. Beardsley	Optical Comparator for Testing Cams