4. Communications: electrical
  5. Condition responsive indicating system
  6. Specific condition

Kenneth R. Reichel

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Audible audio level indicator

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Duplex microphone communication system

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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Outdoor speaker

Acoustics – Plural diaphragm sound sources – Plural chambers
Patent

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Speaker

Recording – communication – or information retrieval equipment – Computer – data processor equipment
Patent

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Variable pattern microphone system

Electrical audio signal processing systems and devices – Directive circuits for microphones
Patent

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Profile ID: LFUS-PAI-P-62547

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