TREA

Periodical acoustic signalling arrangements

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  • CPC
  • G04B21/005
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Parent Industries

GPHYSICS G04Horology G04BMECHANICALLY-DRIVEN CLOCKS OR WATCHES MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS G04B21/00Indicating the time by acoustic means

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G04B21/005Periodical acoustic signalling arrangements
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