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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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FR820292D1937-03-311937-04-05Dispositif pour améliorer la visibilité des signes portés sur les cadrans d'appeldes appareils téléphoniques automatiques
ExpiredFR820292A
(fr)