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550s BC

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

Decades: 600s BC - 590s BC - 580s BC - 570s BC - 560s BC - 550s BC - 540s BC - 530s BC - 520s BC - 510s BC - 500s BC

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... signaling[?] used by Ma Bell (or AT&T) on their long lines. Many phreaking techniques can be implemented with small electronic circuits, easily made by hobbyists once ...