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| Patents for Walter L. Mayhew | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,438,617 | Dec. 12, 1922 | A.H. Starrett | Steel Rule with Holder | rule accessories | |
| 1,439,282 | Dec. 19, 1922 | A.W. Amsden | Gauge for Grinding Drill Bits | special purpose gauges | |
| 1,442,415 | Jan. 16, 1923 | A.H. Starrett | Bench block | ||
| 1,473,946 | Nov. 13, 1923 | W.D. Starrett, A.W. Amsden | Combination hand vise | hand vises | |