message switching
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email
Entity
International Standard Book Number
Entity
telecommunications
Entity
Massachusetts Institute of Technology
Entity
digital object identifier
Entity
router
Entity
SMS
Entity
Q177524
Entity
Western Union
Company
packet switching
Entity
teleprinter
Entity
Q22908627
Entity
Paul Baran
Entity
telegram
Entity
telecommunications network
Entity
Leonard Kleinrock
Entity
circuit switching
Entity
UUCP
Entity
Lawrence Roberts
Entity
leased line
Entity