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BE464330A
(enrdf_load_html_response)
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US2137507A
(en)
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Automatic switching apparatus
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US1555952A
(en)
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Automatic telephone system
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US1355594A
(en)
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Telephone-exchange system
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US1139906A
(en)
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Telephone-exchange system.
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CH299886A
(fr)
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Dispositif de réception de signaux pour installation de télécommunication.
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BE347734A
(enrdf_load_html_response)
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BE469508A
(enrdf_load_html_response)
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US866266A
(en)
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Telephone system.
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BE374766A
(enrdf_load_html_response)
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BE531767A
(enrdf_load_html_response)
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CH96100A
(fr)
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Installation pour bureau central manuel téléphonique.
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BE417423A
(enrdf_load_html_response)
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CH102155A
(fr)
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Installation pour bureau central téléphonique.
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BE482011A
(enrdf_load_html_response)
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GB191415338A
(en)
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|
Improvements in or relating to Telephone System.
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BE488676A
(enrdf_load_html_response)
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BE354594A
(enrdf_load_html_response)
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GB221289A
(en)
|
|
Improvements in automatic telephone switching systems
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GB191329883A
(en)
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|
Improvements in Automatic Selecting Devices for Telephone Systems.
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BE468894A
(enrdf_load_html_response)
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BE485314A
(enrdf_load_html_response)
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BE528427A
(enrdf_load_html_response)
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BE383771A
(enrdf_load_html_response)
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GB191121259A
(en)
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Improvements in Switching Apparatus for Interconnecting the Lines of an Automatic Telephone System.
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