| 摘要 |
PROBLEM TO BE SOLVED: To allow a continuous shooting even after the hit of a 6-mm plastic bullet to a mark without requiring much labor for setting and regulation. SOLUTION: Three marks 2 independently rotating without mutual interference are mounted within a square frame 1 in every two upper and lower stages, totaling 6 marks. Ballast 6 is put in the lower part of each mark 2, whereby the surface side of the mark 2 is regularly turned to a shooter after the hit.
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