Screwdriver head

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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D0606833

CLAIM:
The ornamental design for a screwdriver head, as shown and described.

REFERENCES:
patent: 3114401 (1963-12-01), Johnson
patent: 4056020 (1977-11-01), Coviello
patent: 4779493 (1988-10-01), White
patent: 4880122 (1989-11-01), Martindell
patent: 5533429 (1996-07-01), Kozak
patent: D410372 (1999-06-01), Strauch
patent: 6193242 (2001-02-01), Robison
patent: D462596 (2002-09-01), Fruhm
patent: 6745652 (2004-06-01), Chen
patent: 6883406 (2005-04-01), Yang
patent: 6973858 (2005-12-01), Huang
patent: 7437979 (2008-10-01), Wang

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