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| Patents for Martin Kahr | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,900,384 | Mar. 07, 1933 | M. Kahr | Power Plant for Drilling Apparatus | oilfield machinery | |
| 1,900,385 | Mar. 07, 1933 | M. Kahr | Fuel Feeding Means | fuel pumps | |
| 2,270,059 | Jan. 13, 1942 | M. Kahr | Control mechanism for sawmill carriage steam feeds | sawmill feed works | |
| 2,318,163 | May 04, 1943 | M. Kahr | Saw mill dog | sawmill dogs | |
| 2,560,449 | Jul. 10, 1951 | M. Kahr, V.R. Noll | Free piston engine | ||