Push pull knob

Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning

Design Patent

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Design Patent

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D0520857

CLAIM:
The ornamental design for a push pull knob, as shown and described.

REFERENCES:
patent: D258819 (1981-04-01), Matsuda
patent: D268358 (1983-03-01), Saporito et al.
patent: D276064 (1984-10-01), Stairs, Jr.
patent: D276746 (1984-12-01), Hill et al.
patent: D327834 (1992-07-01), Reid
patent: D365743 (1996-01-01), Decursu et al.
patent: D400778 (1998-11-01), Holbrook, Jr.
patent: D467489 (2002-12-01), Rubinson

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