TREA

Robert B. Welch

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  • Milwaukie, OR, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Loudspeaker coupler
    • Patent number 4,206,831
    • Issue date Jun 10, 1980
    • Welch; Robert B.
    • Robert B. Welch
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Loudspeaker
    • Patent number D252025
    • Issue date Jun 5, 1979
    • Robert B. Welch
    • D14 - Recording, communication, or information retrieval equipment