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Patents for Duff Manufacturing Co.
Patents 1 - 13 of 13
First set of recordsLast set of records
1,052,921Feb. 11, 1913I.E. HindmanLifting-jack
1,054,413Feb. 25, 1913I.E. HindmanLifting-jackautomobile mechanic
1,089,703Mar. 10, 1914I.E. HindmanFriction clutch for screw-jacksindustrial machine clutches
1,089,704Mar. 10, 1914I.E. HindmanRail-fasteningtrack and switches
1,093,269Apr. 14, 1914I.E. HindmanJack
1,107,611Aug. 18, 1914I.E. HindmanLever-socket for lifting-jacksautomobile mechanic
1,147,476Jul. 20, 1915W.M. Alston, I.E. HindmanLifting-jack
1,151,232Aug. 24, 1915W.M. Alston, I.E. HindmanLifting-jack
1,165,380Dec. 28, 1915W.M. Alston, I.E. HindmanLifting-jack
1,228,210May 29, 1917I.E. HindmanScrew-jackautomobile mechanic
1,234,334Jul. 24, 1917I.E. HindmanBrake mechanism for lifting-jacksautomobile mechanic
1,316,575Sep. 23, 1919I.E. HindmanLifting-jackautomobile mechanic
1,323,633Dec. 02, 1919I.E. HindmanLathemetal lathes
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