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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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Engineering & Computer Science
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Signal Processing
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FR701659D1930-09-041930-09-04if pour l'allumage automatique, par un appareil téléphonique, dispositif d'éclairage ou d'un signal lumineux quelconques
ExpiredFR701659A
(fr)