Electricaltelegraphswerepoint-to-pointtextmessagingsystems,primarilyusedfromthe1840suntilthelate20thcentury.Itwasthefirstelectrical ...,2017年11月23日—In1874,ThomasEdisoninventedthefirstquadruplextelegraph,whichwascapableofsendingtwomessagessimul...
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2017年11月23日—In1874,ThomasEdisoninventedthefirstquadruplextelegraph,whichwascapableofsendingtwomessagessimultaneouslyineachdirection.He ...
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