2973456 | Lamp flasher with daylight-responsive inhibiting means | 1961-02-28 | ||
2953752 | Chopper-stabilized amplifier | 1960-09-20 | ||
2918607 | Flasher control circuit | 1959-12-22 | ||
2876387 | Indicator circuit | 1959-03-03 | ||
2873372 | Electric circuit interrupters | 1959-02-10 |