EP0528732A1
(fr )
1993-02-24
Procédé et installation de visiophonie
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US2024581A
(en )
1935-12-17
Telegraph toll system
US2860184A
(en )
1958-11-11
Telephone system serving both regular and paystation telephones
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CH120389A
(fr )
1927-06-16
Installation téléphonique permettant la taxation de connexions de différentes valeurs.
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