concept

Specification of Frederick Charles Rein : apparatus for excluding sound from the ear.

Hearing hazards and recreation / [prepared for the Department of the Environment and the Central Office of Information by the Noise Advisory Council].

Specification of Francis Fearon : softening or deadening sound.

Specification of William Clark : ear stoppers.

Die neueste Erfindung : das Antiphon : ein Apparat zum Unhörbarmachen von Tönen und Geräuschen / von M. Plessner.

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Ear Protective Devices

Catalogue

Specification of Frederick Charles Rein : apparatus for excluding sound from the ear.

Hearing hazards and recreation / [prepared for the Department of the Environment and the Central Office of Information by the Noise Advisory Council].

Specification of Francis Fearon : softening or deadening sound.

Specification of William Clark : ear stoppers.

Die neueste Erfindung : das Antiphon : ein Apparat zum Unhörbarmachen von Tönen und Geräuschen / von M. Plessner.