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| All Patents in class 33/501.11 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 643,080 | Feb. 06, 1900 | J. Boulet | Gear Tooth Calipers | |
| 1,156,694 | Oct. 12, 1915 | T. Kopinski | Gear Teeth Calipers | ||
| 1,524,892 | Feb. 03, 1925 | H.D. Tanner | Gear Testing Device | ||
 | 1,597,636 | Aug. 24, 1926 | W.E. Sykes | Measuring Instrument for Gear Wheel Teeth | |
 | 2,849,802 | Sep. 02, 1958 | C.B. Stapleton | Apparatus for measuring effective dimensions of splines | |