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Response Test Unit Type 4409
Test Records Types QR 2007-08-09
The test
unit and recordings have
been desi
g
ned
to
aid
the accurate investigat ions of the frequency
response
of sound reproducing equipment
i.e.
record
~Iayersl
tape
&
film
recorders
etc.
BRUEL
&
KJ.N..H
N",rum, Denmark.
I!E
800500
.
.;:>"
BRUKJA, Copenhagen.
Telex:
5316
Be
440Q
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