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Patents for Christian E. Ruf
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	1,891,196	Dec. 13, 1932	C.E. Ruf, E.H. Aldeborgh	Combination Dial Indicator
	1,928,001	Sep. 26, 1933	C.E. Ruf, L.G. Spealman, P.D. Ritchey, E.H. Aldeborgh	Projection Indicator Measuring Instrument
	2,095,405	Oct. 12, 1937	C.E. Ruf, E.H. Aldeborgh	Bore Measuring Attachment for Dial Indicators

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