4. Telephonic communications
  5. Diagnostic testing, malfunction indication, or electrical...
  6. Monitoring

Robert G. Dunn

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Diaphragm design for a bender type acoustic sensor

Communications – electrical: acoustic wave systems and devices – Borehole testing
Patent

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Hydrophones and similar devices

Communications – electrical: acoustic wave systems and devices – Distance or direction finding
Patent

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Telephone line monitor/alarm

Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Monitoring
Patent

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Profile ID: LFUS-PAI-P-1572553

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