Animal husbandry – Bed or rest
Patent
1989-09-27
1991-04-23
Yu, Mickey
Animal husbandry
Bed or rest
446170, A01K 1502, A63H 3300
Patent
active
050091930
ABSTRACT:
A torroidal enclosure defining a circular track having a ball located therein. A plurality of oblong openings are formed on the top and a plurality of portal openings are formed in the side. The openings are offset, uniformly alternating with each other, one of the portal openings being large enough to allow the ball to pass through it.
REFERENCES:
patent: 1534964 (1925-04-01), Kahnweiler
patent: 2086631 (1937-07-01), Munro
patent: 3648403 (1972-03-01), Gommel
patent: 4722299 (1988-02-01), Mohr
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