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File:Telephone Switching Systems B Board Machine Originated Calls.jpg

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[[Image:Telephone Switching Systems B Board Machine Originated Calls.jpg|thumb|right| A "B" Board telephone switching machine for terminating  calls to the manual office and redirect to the automatic line]]
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[[Category:Telephone_switching_systems|{{PAGENAME}}]]
 
[[Category:Telephone_switching_systems|{{PAGENAME}}]]

Latest revision as of 21:29, 14 January 2013

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current22:50, 15 February 2012Thumbnail for version as of 22:50, 15 February 2012612×489 (318 KB)Beichner (Talk | contribs)

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