Hydro gyroscope

Games – toys – and sports goods – Toy – Spinning or whirling

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D21455, 2101

Patent

active

D04044380

REFERENCES:
patent: 127619 (1872-06-01), Linn
patent: D331082 (1992-11-01), Levy et al.
patent: 929669 (1909-08-01), Hawks
patent: 1022236 (1912-04-01), Hawks
patent: 2493834 (1950-01-01), Sanders et al.
patent: 2762162 (1956-09-01), Doljan
patent: 2991584 (1961-07-01), Kaufman
patent: 3287846 (1966-11-01), Frangos

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