| 3136867 | Electrostatic transducer | 1964-06-09 | ||
| 3135838 | Electrostatic loudspeaker | 1964-06-02 | ||
| 3030457 | Electrostatic microphone | 1962-04-17 | ||
| 2934612 | Electrostatic speaker | 1960-04-26 | ||
| 2934611 | Electrostatic speaker | 1960-04-26 | ||
| 2855467 | Loud speakers | 1958-10-07 | ||
| 2278835 | Combined lamp and radio receiving set | 1942-04-07 | ||
| 1720544 | Radio receiving apparatus | 1929-07-09 |