Microphone Calibration Apparatus
Type 4141
This instrument is designed for absolute
sensitivity
calibration of condenser microphones by means of
the reciprocity methode and the electrostatic actu-
ator
methode.
BHUEL & KJ"£R
Ncerum, Denmarl< . Phone 80
05
00
Telegrams:
BRUKJA,
Copenhagen
BB
4141
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