Convex multi-level chess board

Details Convex multi-level chess board Convex multi-level chess board

1994-08-01

1996-06-25

Morris, Sandra L.

Games, toys, and sports goods

Toy

Representation or scale model

D21 24

Patent

active

D03711668

REFERENCES:
patent: D215103 (1969-09-01), Stevens
patent: D221390 (1971-08-01), Skillman
patent: D223939 (1972-06-01), Palazzolo
patent: D228775 (1973-10-01), Randell
patent: D259644 (1981-06-01), Israel et al.
patent: D267023 (1982-11-01), Bowser
patent: D321536 (1991-11-01), DeMarco
patent: 4179127 (1979-12-01), Goodman
patent: 5048840 (1991-09-01), Johnson, Jr.
patent: 5358252 (1994-10-01), Mc Phaul

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