4. Acoustics
  5. Geophysical or subsurface exploration
  6. Well logging

John C. Downey Jr.

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Accelerometer transducer used for seismic recording

Acoustics – Geophysical or subsurface exploration – Well logging
Reexamination Certificate

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Two-conductor bidirectional digital seismic telemetry interface

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2805122

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