| Patents Granted on 1931-12-15 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| DE-540,411 | Dec. 15, 1931 | S.E. Co. | Cam Valve Control | industrial valves |
| 1,836,188 | Dec. 15, 1931 | C.D. Salisbury | Injection Valve Means for Hydrocarbon Motors | fuel injection apparatus |
| 1,836,189 | Dec. 15, 1931 | C.D. Salisbury | Internal Combustion Engine Construction | internal combustion engines |
| 1,836,236 | Dec. 15, 1931 | M.J. Goldberg | Internal Combustion Engine | oil engines |
| 1,836,367 | Dec. 15, 1931 | A.N. Emmons | Abrading roller construction | sanding machines |
| 1,836,496 | Dec. 15, 1931 | E.H. Percy | Saw mill log carriage machinery | sawmill dogs |
| 1,837,174 | Dec. 15, 1931 | G.A. Highberg, H.E. Sloan | Chuck | metal lathe chucks |
