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Patents for C. H. Douglas
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
107,671Sep. 27, 1870F. DouglasImprovement in blind-slat tenoning-machinestenoning machines
142,761Sep. 16, 1873S.H. BellowsMachinists' Gagesspecial purpose gauges
165,271Jul. 06, 1875S. StoneImprovement in Grappling-Tongspliers type wrenches
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