Audible and audible-visible alarms with interchangeable cover

Year	Description
1998	Invention patented by Peter B. Tarlton and Inhong Hur on March 19th, 1998. Abstract: The bases of an audible alarm unit and an audible/visible alarm unit are configured to be used interchangeably with a single cover. The cover has an opening that receives a projecting wall portion on the base of the audible alarm unit and a receptacle for a strobe lamp unit on the base of the audible/visible alarm unit. The bases have mounting holes that enable the alarm units to be mounted on several types of standard backboxes, the cover concealing the screw holes for good appearance of the installed units.
1999	Invention patented by Inhong Hur on June 20th, 1999. Abstract: The bases of an audible alarm unit and an audible/visible alarm unit are configured to be used interchangeably with a single cover. The cover has an opening that receives a projecting wall portion on the base of the audible alarm unit and a receptacle for a strobe lamp unit on the base of the audible/visible alarm unit. The bases have mounting holes that enable the alarm units to be mounted on several types of standard backboxes, the cover concealing the screw holes for good appearance of the installed units.
Source: selected by the editor from original sources.

Invention: Audible and audible-visible alarms with interchangeable cover