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| All Patents in class 91/7 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,101,644 | Dec. 07, 1937 | L.F. Nenninger, C. Herfurth, H. Ernst | Grinding Machine | grinding machines | |
| 2,202,256 | May 28, 1940 | O.M. Jensen, F.T. Wruk, T.W. Whitley | Hydraulic feed for power driven hack saws | power hacksaws | |
| 2,300,047 | Oct. 27, 1942 | O.M. Jensen, F.T. Wruk, J.R. McDonald | Hydraulically controlled metal hack saw | power hacksaws | |