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Patents for Park D. Ritchey
Patents 1 - 2 of 2
Picture	Number	Date	Patentee	Title
	1,628,741	May 17, 1927	R.A. Holt, P.D. Ritchey	Adjustable Pin Gauge
	1,928,001	Sep. 26, 1933	C.E. Ruf, L.G. Spealman, P.D. Ritchey, E.H. Aldeborgh	Projection Indicator Measuring Instrument

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