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US2909600A
(en)
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Two-way television over telephone lines
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BE471841A
(forum.php)
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BE479950A
(forum.php)
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Weaver et al.
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In‐Band Single‐Frequency Signaling |
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BE473449A
(forum.php)
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US3482040A
(en)
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Image transmission system
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BE481445A
(forum.php)
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US2921980A
(en)
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Prepay postpay paystation telephone arrangement
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BE471840A
(forum.php)
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BE475936A
(forum.php)
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BE476261A
(forum.php)
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FR2462829A1
(fr)
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Camera de television equipee d'un tube de prise de vues de television et d'un circuit antimicrophonie
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EP0117960B1
(fr)
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Circuit et procédé de réglage automatique de la fréquence centrale d'un filtre
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CH286286A
(fr)
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Installation de central téléphonique.
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US1946228A
(en)
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Telephone system
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FR2754657A1
(fr)
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Dispositif d'interfacage d'une liaison bidirectionnelle courants porteurs basse tension / radiofrequence
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US2955160A
(en)
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Telephone system
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US2895008A
(en)
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Telephone system serving both regular and paystation telephones
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BE481575A
(forum.php)
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BE412135A
(forum.php)
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US3014986A
(en)
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Prepay postpay paystation
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CH306522A
(fr)
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Installation de communication par impulsions électriques à voies multiples.
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CH120391A
(fr)
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Installation téléphonique.
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BE479951A
(forum.php)
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BE480307A
(forum.php)
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