The originating office sends the destination digits to the terminating switch.
2.
Larger post offices also impressed a date-stamp on covers with the name of the originating office.
3.
When the brush passed over a conductive segment, it was grounded, thereby generating a pulse which was sent back to the sender in the originating office for counting.
4.
The toll center picked a trunk through the long distance network to the gateway office, which sent a second wink to the originating office, which then sent the whole dialed number.
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