Baseball batting cages

作者: Thaine High

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摘要: Improvements in baseball batting cages directed to providing a limited area, fully enclosed and automatic cage utilizing conventional pitching machine; improvements the floor configuration of area operative gravity return all pitched balls, whether struck by batter or not, ball pickup zone; an improved device cooperating with said construction making possible operation cage; positioning mounting machine which facilitates being both minimum automatic.

参考文章(3)
Mauney William Clyde, Ball-throwing machine ,(1930)
Charles Edwards, Mechanical base-ball pitcher. ,(1902)