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BE381219A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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US2023011A
(en)
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Telephone system
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US1126727A
(en)
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Selector-switch.
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US1722351A
(en)
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Telephone system
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US1797926A
(en)
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Automatic telephone system
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US1578038A
(en)
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Telephone system
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SU1561210A1
(ru)
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Устройство дл совмещенного включени телефонных аппаратов
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US1515360A
(en)
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Automatic telephone repeater system
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US1131811A
(en)
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Selector for machine-switching telephone systems.
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US1209834A
(en)
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Telephone-exchange system.
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US1364106A
(en)
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Automatic telephone system
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US1337309A
(en)
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Telephone system
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US1308539A
(en)
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clausen |
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US1279841A
(en)
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Telephone-exchange system.
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US1296679A
(en)
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Telephone system.
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US1215925A
(en)
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Telephone-exchange system.
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US1157745A
(en)
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Automatic telephone system.
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US1362096A
(en)
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Telephone system |
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US2327201A
(en)
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Telephone system
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US1123506A
(en)
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Telephone-exchange apparatus and system.
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US1484950A
(en)
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Telephone-exchange system
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US1109216A
(en)
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Automatic telephone-exchange system.
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US1221167A
(en)
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Automatic telephone-exchange system.
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BE411648A
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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GB150072A
(en)
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Improvements in or relating to electrical impulse controlling devices
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