BS 4009:1975

Withdrawn Date published: 31/07/75

Warning: Withdrawn Standard. This document has been withdrawn without replacement. You may wish to search for a more up to date equivalent.

Specification for an artificial mastoid for the calibration of bone vibrators used in hearing aids and audiometers

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Basic features of an artificial mastoid for objective calibration of bone vibrators used in hearing aids and audiometers.

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