Tire tread

Details Tire tread Tire tread

1999-03-23

2000-02-29

Spear, Robert M.

Transportation

Perambulator, invalid chair, or stretcher

Walker

1215

Patent

active

D04212428

REFERENCES:
patent: D251722 (1979-05-01), Tamura et al.
patent: D260756 (1981-09-01), Duncan
patent: D321158 (1991-10-01), Covert et al.
patent: D325365 (1992-04-01), Covert et al.
patent: D385833 (1997-11-01), Ratliff, Jr.
patent: D403624 (1999-01-01), Ratliff, Jr.

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