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CH198010A
(fr)
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Installation téléphonique à batterie centrale.
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US2886641A
(en)
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Recorded message service for telephone paystations
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GB118691A
(en)
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Improved Automatic Telephone System.
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US903547A
(en)
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Telephone system.
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BE417701A
(cg-RX-API-DMAC7.html)
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CH106044A
(fr)
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Installation téléphonique pour bureau privé annexe.
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US673794A
(en)
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Electric signal and telephone system.
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US1379068A
(en)
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Measured-service telephone system
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BE391036A
(cg-RX-API-DMAC7.html)
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BE357752A
(cg-RX-API-DMAC7.html)
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BE455605A
(cg-RX-API-DMAC7.html)
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GB190314363A
(en)
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Improvements in Telephone Call Recording Systems
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CH99878A
(fr)
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Installation téléphonique pour bureau central à commutations automatiques.
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GB191218498A
(en)
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Improved Circuit Arrangements for Automatic Telephone Systems.
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BE341584A
(cg-RX-API-DMAC7.html)
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US1075259A
(en)
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Telephony.
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BE436826A
(cg-RX-API-DMAC7.html)
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BE372105A
(cg-RX-API-DMAC7.html)
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BE473923A
(cg-RX-API-DMAC7.html)
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CH100327A
(fr)
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Installation téléphonique.
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BE383636A
(cg-RX-API-DMAC7.html)
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BE415527A
(cg-RX-API-DMAC7.html)
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BE353077A
(cg-RX-API-DMAC7.html)
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BE384554A
(cg-RX-API-DMAC7.html)
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BE345811A
(cg-RX-API-DMAC7.html)
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