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| All Patents in class 33/544.6 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,881,529 | Apr. 14, 1959 | P.M. Roch | Internal Diameter Micrometer | micrometers | |
| 3,233,330 | Feb. 08, 1966 | C.L. Cho | Micrometer for Inner Measurements | micrometers | |