A magnetically actuated cat door is provided wherein the owner's cat can wear a magnet and go freely in and out of the door while other cats are effectively barred from entering.
申请公布号
US4022263(A)
申请公布日期
1977.05.10
申请号
US19760719904
申请日期
1976.09.02
申请人
BECKETT, RICHARD W.;MCBRIDE, MARIAN P.;JOHNSON, MICHAEL B.
发明人
BECKETT, RICHARD W.;MCBRIDE, MARIAN P.;JOHNSON, MICHAEL B.
