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Patents for R. F. Pray
Patents 1 - 2 of 2
First set of recordsLast set of records
NumberDatePatenteeTitleType
1,259,569Mar. 19, 1918H.G. Dittbenner, F.L. WalkerBand-saw millband sawmills
1,260,837Mar. 26, 1918H.G. Dittbenner, F.L. WalkerUpper saw-guidebandsaws
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