Screwdriver bit head

Details Screwdriver bit head Screwdriver bit head

2001-03-12

2002-02-05

Hyder, Philip S. (Department: 2912)

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

Design Patent

active

D0453289

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

REFERENCES:
patent: 3891017 (1975-06-01), Iskra
patent: 3985170 (1976-10-01), Iskra
patent: D311483 (1990-10-01), Espin
patent: D431768 (2000-10-01), Feik
patent: 6164171 (2000-12-01), Kaneko et al.
patent: 6176161 (2001-01-01), Huang et al.
patent: 6223634 (2001-05-01), Hughes et al.

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