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Noise in a Strowger Telephone Exchange
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  1. Noise in a Strowger
    Telephone Exchange
  2. Strowger
    Telephone System
  3. Telephone
    Step Switch
  4. System X Telephone
    Exchange
  5. Apo Auto Switching
    in Telephone Exchange
  6. Installing Phone Lines
    New Construction
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    Switch
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    Switch
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    Lines
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    Exchange
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