USD245928SExpiredUtility

Air lock for pressurized chambers

Assignee: FRAFJORD TORMODPriority: May 13, 1975Filed: Oct 2, 1975Granted: Sep 27, 1977

Est. expiryMay 13, 1995(expired)· nominal 20-yr term from priority

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exact text as granted — not AI-modified

The ornamental design for an air lock for pressurized chambers, as shown.

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