Screw driver

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2000-07-19

2001-04-17

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

D0440480

CLAIM:
The ornamental design for a screw driver, as shown and described.

REFERENCES:
patent: D. 256547 (1980-08-01), Holland-Letz
patent: D. 256662 (1980-09-01), Holland-Letz
patent: D. 309246 (1990-07-01), Cascio et al.
patent: D. 310011 (1990-08-01), Holland-Letz
patent: D. 408252 (1999-04-01), Holland-Letz
patent: D. 414096 (1999-09-01), Chapin et al.
patent: D. 415005 (1999-10-01), Chen
patent: D. 418035 (1999-12-01), Hatch
patent: D. 422475 (2000-04-01), Su

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