- magnetic earphone
- 电磁式耳机
Medical Chinese dictionary (湘雅医学词典). 2013.
Medical Chinese dictionary (湘雅医学词典). 2013.
Magnetic detector — 1902 1918: Marconi s Wireless Magnetic Detector (London) The magnetic detector was one of the first practical devices able to make radio signals audible through a pair of headphones. It was not as sensitive as some detectors but despite that, it… … Wikipedia
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