Hinged acoustical voice tube
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United States of America Patent
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-
May 22, 1990
Grant Date -
N/A
app pub date -
Jul 29, 1988
filing date -
Jul 29, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An acoustical voice tube, comprising an acoustical hollow upper piece and an acoustical hollow lower piece in hinged connection permits voice or sound tube positioning over a large area without changing the sound characteristics.
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