Ball launcher pet recreational unit
作者： Dean R. Merriman
DOI:
关键词:
摘要:
lens.org 参考文章(10)
Herman L Snitz, Animal training food dispenser ,(1964)
Herbert O Wegner, Animal-training flyball apparatus ,(1969)
Roger C. Bacon, Animal training and amusement device ,(1979)
Evans Grant, Trained animal operated amusement apparatus ,(1963)
Topp Ronald, Ball tossing device ,(1985)
Rex K. Brown, Manually operable ball tossing game apparatus ,(1978)
Theodore M. Strout, Ball projector batting aid ,(1976)
Keller B Breland, Animal operation and reward demonstration apparatus ,(1955)
Michio Nakai, Tsugio Hirabayashi, Tennis ball projector for training purposes ,(1983)
Ian R. James, Ball tossing device ,(1978)