Double helix ladder

Details Double helix ladder Double helix ladder

1995-08-28

1997-11-11

Shooman, Ted

Games, toys, and sports goods

Toy

Representation or scale model

D21244, 2103

Patent

active

D03862372

REFERENCES:
patent: 506238 (1893-10-01), Kirker
patent: 1511139 (1924-10-01), Roziger
patent: 3083015 (1963-03-01), Barenholtz et al.
patent: 3556522 (1971-01-01), Gale
patent: 4497484 (1985-02-01), West
Mexico Forge Co., pp. 14 and 15; tree climber and mini tree climber, Jun. 1984.
Burke playground equipment; p. 10; Spiral ladder, left side of page, Jul. 1995.
GameTime, Inc. Catalog, Cover & pp.5,31 & 52 (1991).

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