TREA

Devices for transmitting, directing, amplifying sound

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Industry

  • CPC
  • G11B3/003
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Parent Industries

GPHYSICS G11Information storage G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER G11B3/00Recording by mechanical cutting, deforming or pressing

Current Industry

G11B3/003Devices for transmitting, directing, amplifying sound
Industries

Patents Grantslast 30 patents

  • Information Patent Grant

    1992585
    • Patent number 1,992,585
    • Issue date Feb 26, 1935
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    1329928
    • Patent number 1,329,928
    • Issue date Feb 3, 1920
    • G11 - INFORMATION STORAGE

Patents Applicationslast 30 patents