4. Communications: electrical
  5. Selective
  6. Interrogation response

H.A. Birmiel

Examiner

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Apparatus for timing the firing of energy sources

Acoustics – Geophysical or subsurface exploration – Programmed or timer-controlled
Patent

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Apparatus for use in investigating earth formations

Communications: electrical – Selective – Interrogation response
Patent

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Banked bombing system

Registers – Calculators – Input-output calculator to indicator – printer – etc.
Patent

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Method and apparatus for creating seismic waves in the earth

Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent

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Parallel operation of seismic vibrators without phase control

Communications: electrical – Selective – Interrogation response
Patent

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Profile ID: LFUS-PAI-P-224283

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