4. Electrical audio signal processing systems and devices
  5. One-way audio signal program distribution

Richard G. Foster

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Dual-driver speaker

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Speaker or housing therefor
Patent

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High impedance piezoelectric transducer

Electrical audio signal processing systems and devices – One-way audio signal program distribution
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Multiple mixer spread spectrum modulation and method therefor

Pulse or digital communications – Repeaters – Testing
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Polyether polyester surfactants, their production and uses

Compositions – Preservative agents – Anti-corrosion
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Profile ID: LFUS-PAI-P-138735

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