| Patents for John C. Campbell |
Patents 1 -
5
of 5
      |
| Number | Date | Patentee | Title | Type |
| 2,039,294 | May 05, 1936 | J.C. Campbell | Automatic Manual Control Subordinator for Tracer Controlled Machines | milling machines |
| 2,083,774 | Jun. 15, 1937 | J.C. Campbell | Sensitive Valve Mechanism | hydraulic apparatus |
| 2,089,099 | Aug. 03, 1937 | J.C. Campbell, E.G. Roehm | Die Sinking and Engraving Machine | milling machines |
| 2,164,900 | Jul. 04, 1939 | J.C. Campbell | Dynamic Balancer for Machine Tools | grinding machines |
| 3,163,180 | Dec. 29, 1964 | J.C. Campbell | Plunger Construction for Fluid Flow Control Valve | hydraulic apparatus |
