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FR2463465A1
(fr )
1981-02-20
Dispositif d'alarme a teletransmission automatique
FR2622380A1
(fr )
1989-04-28
Systeme de distribution de lignes telephoniques pour un poste telephonique simple
BE427161A
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BE353077A
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CH132457A
(fr )
1929-04-15
Installation téléphonique semi-automatique.
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FR2499804A1
(fr )
1982-08-13
Prolongateur d'appel telephonique sur voie radio-electrique
CH96261A
(fr )
1922-09-16
Installation pour bureau central téléphonique du type manuel.
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