Multi-level maze toy

Games – toys – and sports goods – Toy – Representation or scale model

Patent

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D21 12, 2101

Patent

active

D03793818

REFERENCES:
patent: D250286 (1978-11-01), Zelenko
patent: D261911 (1981-11-01), Mayuzumi
patent: D273964 (1984-05-01), Roth
patent: 2467781 (1949-04-01), Ribbe
patent: 2563608 (1951-08-01), Laufer
patent: 3406971 (1968-10-01), Koff
patent: 3787054 (1974-01-01), Stafford
patent: 4509753 (1985-04-01), Vaughan, Jr.
Bits and Pieces Catalog; pp. 52-53; Oct. 1995; Triple Labyrinth Puzzle.

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