Toy for children to tie knots

Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor

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Patent

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D03684920

REFERENCES:
patent: D152990 (1949-03-01), Leonard
patent: 2385197 (1945-09-01), Eisel
patent: 2624957 (1953-01-01), Collins
patent: 4017984 (1977-04-01), Bonfigli
patent: 4342557 (1982-08-01), Bandar

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