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초기에는 진공관 전압계를 생산하는 작은 회사였다. 1947년 첫 번째 마이크로폰 'MD 1'을 개발하면서 음향 산...
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[지디넷코리아]"생성함수가 다가오는 산업혁명의 증기기관과 진공 튜브입니다." 공무원 9급 시험에 나오는 영어 문제...
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