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| Patents for Primus Manufacturing Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,311,985 | Apr. 04, 1967 | M.E. Hodge | Friction wheel measuring apparatus | ||
| 3,378,929 | Apr. 23, 1968 | E.J. Williams, C.E. Deardorff | Measuring device | ||
| 3,561,120 | Feb. 09, 1971 | I.H. Culver | Distance measurement with friction wheel devices | ||
| 3,561,121 | Feb. 09, 1971 | I.H. Culver | Distance measurement with friction wheel devices | ||
| 3,724,082 | Apr. 03, 1973 | I.H. Culver | Flexure mounting for friction-wheel measurement device | ||