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Hearing Aid Test Box Type 4212
A chamber for acoustical and electro-acoustical
testing of all types of hearing aids and small
microphones
under practically free field conditions
in
the frequency range 150 c/s to 5ooo
c/s.
BHUEL &. KJN..R
Ni!!rum, Denmark .
~
80 05 00 •
~
BRUKJA, Copenhagen
.
Telex: 5316
BB 4212
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