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GB 11455-1989 in English
Hearing aid equipment not entirely worn on the listener
abolished
Issued on:1989-06-02
$48.00 -
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GB/T 11454-1989 in English
Magnetic field strength in audio-frequency induction loops for hearing aid purposes
superseded
Issued on:1989-06-02
$288.00 -
GB 7614-1987 in English
An artificial ear of wide band type for the calibration of earphones used in audiometry
valid
Issued on:1987-04-02
$112.00 -
GB 6832-1986 in English
Methods of measurement on headphones
superseded
Issued on:1986-09-03
$512.00 -
GB 3661-1983 in English
Technical specification of measurement condenser microphones
valid
Issued on:-
$416.00