Air stone

Animal husbandry – Feeder or waterer – Bird feeder

Patent

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Details

D3099

Patent

active

D02498979

REFERENCES:
patent: 3507253 (1970-04-01), Willinger
patent: 3524430 (1970-08-01), Willinger
patent: 3575350 (1971-04-01), Willinger

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