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| Patents for Primus Manufacturing, Inc. | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,307,265 | Mar. 07, 1967 | E.J. Williams, F.P. Jenks | Distance measuring by friction wheel instruments | ||
| GB-1,340,781 | Feb. 13, 1971 | I.H. Culver | Improvements relating to mounting mechanisms for friction wheel measuring devices | ||
| GB-1,411,291 | Oct. 22, 1975 | I.H. Culver | Friction wheel measuring devices | ||