| 摘要 |
1,030,340. Sound-producing instruments. ERICSSON TELEPHONES Ltd. Aug. 28, 1964 [Oct. 3, 1963], No. 38907/63. Heading G5J. The transformer field of a transistor blocking oscillator is used to operate a warning device 6 such as a diaphragm, the vibrator of a buzzer or a hammer striking an electric bell. |
