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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
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FR392872D1908-08-011908-08-01Perfectionnements dans les accessoires de transmetteurs téléphoniques
ExpiredFR392872A
(fr)