产品证书：对于电气化门用五金，由制造商颁发。
G. Product Certificates: For electrified door hardware, from the manufacturer.
操作叙述：描述由电气化门用五金控制的门操作。
Operation Narrative: Describe the operation of doors controlled by electrified door hardware.
来源限制：只从同一个制造商获取每种门用五金类型。
B. Source Limitations: Obtain each type of door hardware from a single manufacturer.
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