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| All Patents in class 83/526 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 502,996 | Aug. 08, 1893 | H.L. Pratt | Hack-saw machine | |
 | 2,202,256 | May 28, 1940 | O.M. Jensen, F.T. Wruk, T.W. Whitley | Hydraulic feed for power driven hack saws | |