4. Acoustics
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Protective facility for suppressing noise produced at high gas f

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent

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Protective stethoscope cover having a head cover connected to a

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent

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Pulsation dampener and acoustic attenuator

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent

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Pulsation damper

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Reexamination Certificate

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Pulse converting exhaust silencing system

Acoustics – Auditorium
Patent

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Pulse damper

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent

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Pulse generator powered vibrator

Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent

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Pulsed high pressure liquid propellant combustion powered seismi

Acoustics – Geophysical or subsurface exploration – Seismic wave generation
Patent

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Purging pipes under noise-attenuating conditions

Acoustics – Sound-modifying means – Housing or enclosure
Patent

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Push-pull transducer system

Acoustics – Plural diaphragm sound sources
Patent

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Pyramid loudspeakers with twin cross-phased mid-range speakers

Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent

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Pyramid speaker assembly

Acoustics – Diaphragm and enclosure – Reflector baffle
Patent

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