The invention has the advantages of safe and labor-saving, convenient mounting, demounting and maintenance, being easy to pull the chains, etc.
本发明具有安全省力、便于安装及拆卸维护，以及便于拉动链条等优点。
The invention has the advantages of safe and labor-saving, convenient mounting, demounting and maintenance, being easy to pull the chains, etc.
本发明具有安全省力、便于安装及拆卸维护，以及便于拉动链条等优点。
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