Transportation – Perambulator – invalid chair – or stretcher – Walker
Patent
1998-07-23
1999-12-07
Spear, Robert M.
Transportation
Perambulator, invalid chair, or stretcher
Walker
1215
Patent
active
D04174186
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patent: D291675 (1987-09-01), Mader
patent: D313959 (1991-01-01), Kobayashi et al.
patent: D315703 (1991-03-01), Aoki
patent: D336873 (1993-06-01), Suzuki
patent: D341347 (1993-11-01), Kobayashi
patent: D344256 (1994-02-01), Suzuki
patent: D381298 (1997-07-01), Haas
patent: D390815 (1998-02-01), Ishikawa
Dunlop K455 Sport Radial Front Tire, 1996 Tread Design Guide, p. 213, Feb. 1996.
Michelin Tarmac Tire, 1996 Tread Design Guide, p. 220, Feb. 1996.
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