Invention Grant
US07791496B2 Plug-in speaker for emergency notification and voice evacuation 有权
插入式扬声器用于紧急通知和语音疏散

Plug-in speaker for emergency notification and voice evacuation
Abstract:
An alarm indicating output appliance can be releasably affixed to a mounting plate. The plate carries wire receiving terminals which couple to the appliance. In the absence of the appliance, at least two of the terminals can be short circuited.
Public/Granted literature
Information query
Patent Agency Ranking
0/0