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1.发明授权Apparatus for controlling the placement of a covering over base-ball diamonds. 失效用于控制基座球的覆盖物的放置的装置。
公开(公告)号：US1155309A
公开(公告)日：1915-09-28
申请号：US1914846253
申请日：1914-06-20
Applicant: EMIL AMELING , HECKEL OTTO A
Inventor： HECKEL OTTO A
CPC classification number: G11B23/04 , Y10S242/919
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