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发明授权
US5072356A Ladder drum sequence controller 失效
梯形滚筒顺序控制器

Ladder drum sequence controller
摘要：
A drum-type sequencer operable in a ladder logic program and capable of being selectively stepped in various modes; that is, in forward stepped sequence, non-sequentially, and backwardly.
摘要（中）：

鼓式定序器，其可操作在梯形逻辑程序中并且能够以各种模式选择性地步进; 也就是说，在前进步进序列中，非顺序地和后向的。

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