4. Amplifiers
  5. With semiconductor amplifying device
  6. Including frequency-responsive means in the signal...

CB Labs, Inc.

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Portable musical instrument amplifier

Electrical audio signal processing systems and devices – Headphone circuits
Patent

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Portable musical instrument amplifier with a movable plug

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
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System for controlling the dynamic range of electric musical ins

Amplifiers – With semiconductor amplifying device – Including frequency-responsive means in the signal...
Patent

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