open signal disc

open signal disc
сигнальный диск в разрешающем положении

Англо-русский железнодорожный словарь. 2013.

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  • History of sound recording — Methods and media for sound recording are varied and have undergone significant changes between the first time sound was actually recorded for later playback until now. Technology Mechanical recording The first devices for recording sound were… …   Wikipedia


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