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2cm3 coupler used for
free field
measuremen~
on spectacle-type hearing aid
Fig. 3.3. Coupler mounting for measurements on l1earing aid earphones witl1
coupling pieces.
158231
Flexible connecting tube rT)Ounted
on adapter. The adapter is in this
case replacing the
ear insert
Fig. 3.4-. Coupler mounting for measurements on hearing aids, spectable
type,
coupler directly attached to the sound tube.
19
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