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| Patents for John C. Campbell | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,039,294 | May 05, 1936 | J.C. Campbell | Automatic Manual Control Subordinator for Tracer Controlled Machines | ||
| 2,083,774 | Jun. 15, 1937 | J.C. Campbell | Sensitive Valve Mechanism | ||
| 2,089,099 | Aug. 03, 1937 | J.C. Campbell, E.G. Roehm | Die Sinking and Engraving Machine | ||
| 2,164,900 | Jul. 04, 1939 | J.C. Campbell | Dynamic Balancer for Machine Tools | ||
| 3,163,180 | Dec. 29, 1964 | J.C. Campbell | Plunger Construction for Fluid Flow Control Valve | ||