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Patents for Ralph D. Gardner
Patents 1 - 10 of 10
First set of recordsLast set of records
NumberDatePatenteeTitleType
1,416,952May 23, 1922R.D. GardnerRing-grinding machine
1,465,762Aug. 21, 1923R.D. GardnerDouble-spindle disk grinderdisk sanders
1,523,952Jan. 20, 1925J. Nielsen, R.D. Gardner, E.B. GardnerGrinding machinedisk sanders
1,563,901Dec. 01, 1925R.D. GardnerGrinding machine
1,651,382Dec. 06, 1927R.D. Gardner, J. Nielsen, E.B. GardnerGrinding machine
1,659,092Feb. 14, 1928E.B. GardnerRing-grinding machine
1,661,330Mar. 06, 1928R.D. Gardner, J. Nielsen, E.B. GardnerGrinding machine
1,670,111May 15, 1928E.B. GardnerGrinding machine
2,103,074Dec. 21, 1937R.D. GardnerClamping devicework holding
2,107,566Feb. 08, 1938R.D. GardnerAbrasive-sawing machinemetal sawing machines
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