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| View Original: | Pat_no_447918_Strowger.jpg (425x640) | |||
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| Keywords: Pat no 447918 Strowger.jpg Patentschrift Automatic Telephone Exchange de wikipedia Saibo CommonsHelper 1891-03-10 Strowger PD-old PD-US-patent Original upload log page de wikipedia Automatic_Telephone_Exchange_2 jpg 2005-05-18 12 39 Matthias Bock 425×640× 53304 bytes <nowiki>Automatic Telephone Exchange andere Version Automatic_Telephone_Exchange jpg PD da vor dem 1 Januar 1923 veröffentlicht</nowiki> Strowger switches | ||||
