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Publication of FR335880ApublicationCriticalpatent/FR335880A/fr
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/02—Constructional features of telephone sets
H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
FR335880D1903-10-131903-10-13Accessoire perfectionné pour appareils téléphoniques
ExpiredFR335880A
(fr)