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Patents for Perley D. Cummings
Patents 1 - 4 of 4
First set of recordsLast set of records
109,591Nov. 29, 1870P.D. CummingsImprovement in machines for making key-boards for wood pavementsspecialty machines
110,440Dec. 27, 1870P.D. CummingsImprovement in machines for grooving blocks for wood pavementsspecialty machines
139,457Jun. 03, 1873P.D. Cummings, M. Smith, J.C. JordanImprovement in machines for cutting matchesmatch making machines
145,488Dec. 16, 1873P.D. CummingsGrinding Machinesgrinders
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