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557

Centuries: 5th century - 6th century - 7th century

Decades: 490s - 500s - 510s - 520s - 530s - 540s - 550s - 560s - 570s - 580s - 590s

Years: 552 553 554 555 556 557 558 559 560 561 562


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Homing pigeon

... services in cases of natural disaster. The humorous RFC 1149 is an Internet protocol for the transmission of messages via carrier pigeon. This protocol has been used ...