4. Communications, electrical: acoustic wave systems and devices
  5. Signal transducers
  6. Underwater type

John P. Kirby

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Folding photographic method and apparatus

Photography – Having variable focal length of camera objective – Lens moves in or out of light path
Patent

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Self-developing camera

Photography – Self-developing camera – Including means to treat superimposed material
Patent

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Ultrasonic transducer for use in a corrosive/abrasive environmen

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

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Profile ID: LFUS-PAI-P-889398

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