Transportation – Perambulator – invalid chair – or stretcher – Walker
Patent
1999-10-06
2000-07-25
Spear, Robert M.
Transportation
Perambulator, invalid chair, or stretcher
Walker
1215
Patent
active
D04285867
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patent: 4221254 (1980-09-01), Roberts et al.
patent: 4711283 (1987-12-01), Bonko et al.
patent: 5259429 (1993-11-01), Harms
patent: 5375640 (1994-12-01), Harms
patent: 6021829 (2000-02-01), Rooney
Maxxis Rubicon Tire, 1998 Tread Design Guide, p. 219. Apr. 1.
King David L
Spear Robert M.
The Goodyear Tire & Rubber Company
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