| 1589692 | Choke-coil amplification unit | |||
| 1661953 | Inductive reactor | |||
| 1779242 | Process of impregnating carbon electrodes | |||
| 2130741 | Stuffing box | |||
| 2144353 | Variable inductance device | |||
| 2179257 | Induction coil | |||
| 2190048 | Permeability-tuned oscillator tracking arrangement | |||
| 2343999 | Variable inductor | |||
| 2402903 | Process for coating sheet materials | |||
| 2435630 | Tuned transformer assembly | |||
| 2459605 | Induction coil |