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The electric immobiliser/alarm system was invented by St. George Evans and Edward Birkenbuel and patented in 1919. [2] They developed a 3x3 grid of double-contact switches on a panel mounted inside the car so when the ignition switch was activated, current from the battery (or magneto) went to the spark plugs allowing the engine to start, or immobilizing the vehicle and sounding the horn. [3]
UL 1076, Proprietary Burglar Alarm Units and Systems (DOD Approved: April 09, 1992, ANSI Approved: February 16, 2021) [40] [41] UL 1481, Standard for Power Supplies for Fire-Protective Signaling Systems [42] UL 1610, Central-Station Burglar-Alarm Units [43] UL 1635, Standard for Digital Alarm Communicator System Units (ANSI Approved: April 13 ...
An alarm monitoring center, central monitoring station (also known as "CMS" or wholesale central station), or alarm receiving center (also known as ARC) [1] is a company that provides services to monitor burglar, fire, and residential alarm systems. The Central Monitoring Station may also provide watchman and supervisory services.
Frequently, false alarms occur because car alarm owners use high sensitivity settings. This may be the main reason why loud bass frequency sound (loud music, other cars or motorcycles with loud exhaust systems, thunderstorms, etc.) can set off car alarms. The second possible reason is that some parts of the alarm system may be improperly installed.
The Chicago metropolitan area – also known as "Chicagoland" – is the metropolitan area associated with the city of Chicago, Illinois, and its suburbs. [2] With an estimated population of 9.4 million people, [3] it is the third largest metropolitan area in the United States [4] and the region most connected to the city through geographic ...
This list may not reflect recent changes. (previous page) * List of companies in the Chicago metropolitan area; 0–9. 37signals; 1871 (company) A. A and T Recovery;
Chicago is also divided into 77 community areas which were drawn by University of Chicago researchers in the late 1920s. [3] Chicago's community areas are well-defined, generally contain multiple neighborhoods, and depending on the neighborhood, less commonly used by residents. [2] [4]
They have contributed to Chicago's reputation as the "city of neighborhoods", and are argued to break up an intimidating city into more manageable pieces. [2] Chicago was an early adopter of such a system, and as of 1997 most cities in the United States still lacked analogous divisions. [2]