我局广大电信职工在毛主席“备战、备荒、为人民”的战略方针指引下,大搞技术革新、技术革命,在1970年用市售普通低频晶体管在磁石电话机送话部分,加装一级送话发大器。经过几年来实践,证明具有音量大、耗电少、易于普及等优点,现已在全区普遍推广。 Under the guidance of Chairman Mao’s strategic policy of “preparing for war, preparing for waste, and providing for the people”, the majority of telecommunications staff of the Bureau engaged in technological innovation and technological revolution. In 1970, they used commercially available ordinary low-frequency transistors to send parts to magnet telephones and installed one. Grade sender hair amplifier. After years of practice, it has proved that it has the advantages of large volume, low power consumption, and easy popularization. It has now been widely promoted throughout the region.