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BE362158A
(enrdf_load_html_response)
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US2652455A
(en)
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Conversation timing controlled in linefinders and repeaters
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US2615092A
(en)
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Discriminating service telephone system
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US1738564A
(en)
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christian |
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US2996582A
(en)
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Discriminating trunk circuit
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US2224701A
(en)
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Telephone system
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US4169221A
(en)
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Method and apparatus for testing a subscriber line group marker of a telephone central office cross bar switching device
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BE351277A
(enrdf_load_html_response)
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BE369046A
(enrdf_load_html_response)
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US1639089A
(en)
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Automatic telephone system
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US1592684A
(en)
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Large-capacity telephone system
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BE361645A
(enrdf_load_html_response)
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US1393728A
(en)
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Telephone-exchange system
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BE361358A
(enrdf_load_html_response)
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BE355261A
(enrdf_load_html_response)
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US3495043A
(en)
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Digit absorbing selector memory circuit and trunk splitting circuit
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BE475947A
(enrdf_load_html_response)
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BE432949A
(enrdf_load_html_response)
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BE353777A
(enrdf_load_html_response)
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GB209040A
(en)
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|
Improvements in or relating to telephone systems
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BE334997A
(enrdf_load_html_response)
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BE481276A
(enrdf_load_html_response)
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BE360010A
(enrdf_load_html_response)
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BE353046A
(enrdf_load_html_response)
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BE356428A
(enrdf_load_html_response)
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