The above function can operate both square and spring latches by the key but the normal one need to operate individually.

 
  • 還有上下聯(lián)動(dòng)或上、中、下聯(lián)動(dòng)(如多點(diǎn)鎖閉)等,則屬于聯(lián)動(dòng)的范疇。
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