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| All Patents in class 33/501.14 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,898,084 | Feb. 21, 1933 | J.C. Drader | Lead Testing Machine | ||
 | 1,949,014 | Feb. 27, 1934 | S.H. Earl, J.E. Gleason | Cutter Truing Fixture | |
| 1,961,925 | Jun. 05, 1934 | W.F. Dalzen, J.C. Drader | Testing Device | ||
| 2,046,506 | Jul. 07, 1936 | J.C. Drader | Lead Testing Machine for Spiral Gears | ||
| 2,336,747 | Dec. 14, 1943 | P.O. Palmquist | Lead Checking Fixture | ||
| 2,861,348 | Nov. 25, 1958 | W.R. Carsen | Axial Pitch Measuring Device | ||