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20 March, 03:51

Four communication improvements included:

the telephone

the telegraph

assembly line

mail delivery

Trans-Atlantic Cable

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  1. 20 March, 03:57
    0
    The telephone, telegraph, mail delivery, and Trans-Atlantic Cable were all technologies for communication. The assembly line was not, it had nothing to do with communication, therefore that one does not belong, leaving you with the other four.
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