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
Chalk is a soft form of the mineral calcium carbonate. Chalk can be found in many places, including:
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