USD258410SExpiredUtility

Fireplace combustion air duct

Assignee: C MAYO INCPriority: Feb 27, 1978Filed: Feb 27, 1978Granted: Mar 3, 1981

Est. expiryFeb 27, 1998(expired)· nominal 20-yr term from priority

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exact text as granted — not AI-modified

The ornamental design for a fireplace combustion air duct, as shown.

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