guard chain door lock 防盗门锁

chain guard 链罩 ; 护链板 ; 炼盖 ; 护链罩

safe-guard door chain 防盗门链

chain-guard 防护链条

drive chain guard 传动链条罩 ; 驱动链保护装置 ; 驱动链保护装配

main drive chain guard 主驱动链保护装置

chain track guard 护链槽

chain guard device 导链装置

guard saw chain 防护锯链