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 Telecommunications Object Thesaurus Term

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acoustic telegraph

acoustic telegraphs

Initial Reference:
The Electric Telegraph, by D Lardner (London, 1855)

Top term:

Broader term:

Narrower term(s):

Scope notes:
Class of telegraphs in which sound or physical vibration is used to carry text messages. Examples include signalling drums, fog horns and time-signal canons.


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