1. An interface device for coupling electrical signals by acoustical means--usually into and out of a telephone instrument.
2. A terminal device used to link data terminals and radio sets with the telephone network.
Note: The link is achieved through acoustic (sound) signals rather than through direct electrical connection.
Source: from Federal Standard 1037C and from MIL-STD-188
... type were built by AG Weser and Seebeck Yard[?] of Bremen, and Deutsche Werft[?] of Hamburg.
U-167[?] - U-168[?] -
U-169[?] - U-170[?] -
U-183[?] - U-184[?] ...
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