TREA

by closing a contact to put into action electro-acoustic means

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Industry

  • CPC
  • G04C21/28
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Parent Industries

GPHYSICS G04Horology G04CELECTROMECHANICAL CLOCKS OR WATCHES G04C21/00Producing acoustic time signals by electrical means

Current Industry

G04C21/28by closing a contact to put into action electro-acoustic means
Industries