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| Patents Granted on 1948-04-13 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,439,568 | Apr. 13, 1948 | L.C. Hall | Saw Guard | ||
| 2,439,596 | Apr. 13, 1948 | S.A. Crosby | Air filter for polishing machines | handheld power sanders | |