AT&T introduced dial phones in 1919. Prior to this, the phone user contacted the operator who connected the call. However, this situation became impra...

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Image Number:  1895-11776Rights ManagedCredit Line:SM/SSPL/Science and Society/SuperStockCollection:Science and SocietyContributor:SM/SSPLModel Release:NoProperty Release:NoResolution:3646×2492
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