Plug for the interior of a tube

Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified

Design Patent

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Design Patent

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D0601688

CLAIM:
The ornamental design for a plug for the interior of a tube, as shown and described.

REFERENCES:
patent: 4069535 (1978-01-01), Cato
patent: 4083074 (1978-04-01), Curtis
patent: 4244073 (1981-01-01), Sagawa
patent: D351898 (1994-10-01), Stowers, Jr.
patent: D393115 (1998-03-01), Bell et al.
patent: 6038725 (2000-03-01), Knapp
patent: D437412 (2001-02-01), Maeji et al.
patent: D458350 (2002-06-01), Wagner et al.
patent: 6613261 (2003-09-01), Knapp
patent: 6792641 (2004-09-01), Laker
patent: D545405 (2007-06-01), Nightlinger et al.
patent: 7454812 (2008-11-01), Lyle
patent: D584375 (2009-01-01), Sims

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