Limit travel switch, play safe and limit the role of.
限位行程开关，起到安全和限位作用。
Limit switch: using limit switch component in designation to protect chain and ensure and security.
极限开关：吊上吊下都有极限开关部件，防止链条超出确保安全。
Limit switch: using limit switch component in designation to protect chain and ensure and security.
极限开关：吊上吊下都有极限开关部件，防止链条超出确保安全。
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