自动检票闸门真的是日本发明的吗？

Were automatic ticket gates really invented in Japan?

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根据静态平衡理论分析研究了连杆滚轮式水力自动翻板闸门的静态稳定性。

So the hydraulic automatic tilting gate with connecting lever and rolling wheel can ensure the stability of itself.

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采用特制的对晶直探头和检测闸门自动跟踪底波，可存储缺陷回波波形并打印输出。

The special dual-crystal straight probe and inspection gate can save and print out the flaw wave.

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