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Fire detection and alarm companies (36 P) L. L3Harris Technologies (1 C, 17 P) Lock manufacturers (24 P) V. ... Pages in category "Security equipment manufacturers"
Guardian Alarm is an American security company based in Southfield, Michigan. Founded in 1930, Guardian Alarm is the largest independently owned security company in the Midwest and continues to be ranked in the top 20 in the United States. The company has over 500 employees in various cities across the United States.
ADT began to expand into new areas, such as fire alarms and security alarms, between 1910 and 1930, but was kept separate from AT&T's Holmes alarm business. ADT became a publicly traded company in the 1960s. [12] In 1964, ADT was found to be a monopoly in restraint of trade. It was shown to provide almost 80% of the central station alarm ...
Pages in category "Companies based in the Columbus, Ohio metropolitan area" The following 125 pages are in this category, out of 125 total. This list may not reflect recent changes .
Authorization may be indicated in any number of ways, often with keys or codes used at the control panel or a remote panel near an entry. High-security alarms may require multiple codes, or a fingerprint, badge, hand-geometry, retinal scan, encrypted-response generator, and other means that are deemed sufficiently secure for the purpose.
The standard details requirements for a range of alarm systems including central station burglar alarms, police station connected alarms, local alarms, proprietary systems, holdup alarms, and digital alarm communicator system units. It also covers power supplies essential for burglar-alarm equipment operation.
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