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H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/02—Constructional features of telephone sets
H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials
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Signal Processing
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FR805483D1935-12-131936-04-25Dispositif sélecteur avec tableau à numéros pour appareils téléphoniques pourvus d'un disque sélecteur
ExpiredFR805483A
(fr)