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| Patents Granted on 1951-03-13 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,544,795 | Mar. 13, 1951 | R.G. Knudsen | Reversible Ratchet Mechanism | ratchet wrenches | |
| 2,544,814 | Mar. 13, 1951 | E.J. Warren | Assembly for tiltably mounting a circular saw on an arbor | sawblades | |
| 2,544,966 | Mar. 13, 1951 | R.E. Schulz | Hydraulically operated chuck | crankshaft lathes | |
| 2,545,053 | Mar. 13, 1951 | G.J. Kasselmann, H.J. Siekmann | Lathe Transmission and Control Mechanism | metalworking machine mechanisms | |