- rotary lock
- rotary lock - A special lock for pouches of registered mail. The lock is cylindrical and made of brass. The words "Registered U.S. Mail" are engraved on the front of the lock, and the back is engraved with the accountable serial number. A counter in the lock rotates to the next higher number with each turn of the key.
Glossary of postal terms. 2014.
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