Air stone

Details Air stone Air stone

1991-04-24

1993-03-16

Zarfas, Louis S.

Animal husbandry

Aquarium, fish bowl, or stand therefor

Element or attachment

Patent

active

D03340864

REFERENCES:
patent: D249897 (1978-10-01), Willinger
patent: 1920220 (1933-08-01), Staley
patent: 2008363 (1935-07-01), Maris
patent: 2245495 (1941-06-01), Pemble
patent: 2711714 (1955-06-01), Timeus
patent: 3320928 (1967-05-01), Smith
patent: 3507253 (1970-04-01), Willinger
patent: 3773015 (1973-11-01), Cruickshank et al.
patent: 4776127 (1988-10-01), Jackson
patent: 5034165 (1991-07-01), Willinger et al.
patent: 5133906 (1992-07-01), Louis

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