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| All Patents in class 91/55 | |||||
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| Number | Date | Patentee | Title | Type | |
| 644,598 | Mar. 06, 1900 | C.O. Heggem | Motor Vehicle | automobiles | |
| 1,976,122 | Oct. 09, 1934 | F.S. Haas | Hydraulic Drive for Grinding Machines | grinding machines | |
| 2,137,462 | Nov. 22, 1938 | M. Romaine | Index Head | indexers and dividers | |
| 2,616,323 | Nov. 04, 1952 | L.A. Leifer | Power Actuated Wrench | metal lathe accessories and attachments | |
| 2,889,755 | Jun. 09, 1959 | W. Schroeder | Machine Tool Transmission | metalworking power transmission | |