4. Communications: electrical
  5. Selective
  6. Having indication or alarm

Frank R. Abbott

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Electro-ceramic stack

Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent

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High fidelity low frequency transducer for use at great depth

Communications: electrical – Selective – Having indication or alarm
Patent

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Towable VLF sonar projector

Communications: electrical – Selective – Having indication or alarm
Patent

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Towable VLF sonar projector

Communications: electrical – Selective – Having indication or alarm
Patent

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Underwater audio intercommunication system

Communications – electrical: acoustic wave systems and devices – Underwater system – Analog speech communication
Patent

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Profile ID: LFUS-PAI-P-720904

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