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BE382658A
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CH120389A
(fr )
1927-06-16
Installation téléphonique permettant la taxation de connexions de différentes valeurs.
BE409407A
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BE481072A
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CH121677A
(fr )
1927-09-01
Installation téléphonique.
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BE422189A
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CH126309A
(fr )
1928-07-16
Installation de distribution d'appels pour centrales téléphoniques.
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