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| All Patents in class 33/837 | |||||
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| Number | Date | Patentee | Title | Type | |
| 904,277 | Nov. 17, 1908 | F.G. Purinton | Liquid Micrometer Indicator | test indicators | |
| 1,245,559 | Nov. 06, 1917 | T.S. Booth | Liquid Micrometer Indicator | test indicators | |
| 1,845,437 | Feb. 16, 1932 | M.K. Parkhurst | Measuring Device | ||
| 2,349,838 | May 30, 1944 | C. Granqvist, H.V. Alexandersson | Micrometer | micrometers | |
| 2,626,464 | Jan. 27, 1953 | M. Mennesson | Micrometer | micrometers | |
| 3,226,836 | Jan. 04, 1966 | R.D. Bond | Fluid-entry-resistant gauges and method | ||