USD414257SExpiredUtility

Flue pipe heat exchanger

Assignee: ESTRADA ROSALIOPriority: Jul 2, 1998Filed: Jul 2, 1998Granted: Sep 21, 1999

Est. expiryJul 2, 2018(expired)· nominal 20-yr term from priority

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exact text as granted — not AI-modified

The ornamental design for a flue pipe heat exchanger, as shown and described.

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