Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
G08B26/008—Alarm systems in which substations are interrogated in succession by a central station central annunciator means of the sensed conditions, e.g. displaying or registering