4. Communications, electrical: acoustic wave systems and devices
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Roll-along switch

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

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Rotary acting shear valve for drilling fluid telemetry systems

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Patent

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Rotary subwoofer marine seismic source

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

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Rotating acoustic transducer head for cement bond evaluation too

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent

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Rotating eccentric weight apparatus and method for generating co

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

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Rotational geophone

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

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Rotational geophone

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

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Rotational pulsation system and method for communicating

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through well fluids
Reexamination Certificate

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Runway and obstacle detector to improve airplane landing

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

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