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2. SimplexGrinnell - Wikipedia

   en.wikipedia.org/wiki/SimplexGrinnell

   SimplexGrinnell, a subsidiary of Johnson Controls, is an American company specializing in active fire protection systems, communication systems and testing, inspection and maintenance services. The company headquarters is in Boca Raton , Florida ; corporate sales and marketing offices are in Westminster , Massachusetts , and the company has ...

3. James McHugh Construction Co - Wikipedia

   en.wikipedia.org/wiki/James_McHugh_Construction_Co

   McHugh began sending crews across the country for heavy construction work, including water treatment systems and transportation tunnels. The postwar era of the 1940s and 1950s saw a resurgence of the market for institutional facilities and public works structures as Chicago struggled to keep pace with its booming population.

4. List of companies in the Chicago metropolitan area - Wikipedia

   en.wikipedia.org/wiki/List_of_companies_in_the...

   This is a list of companies in the Chicago metropolitan area. The Chicago metropolitan area – also known as "Chicagoland" – is the metropolitan area associated with the city of Chicago , Illinois , and its suburbs. [ 2 ]

5. Frederick Grinnell - Wikipedia

   en.wikipedia.org/wiki/Frederick_Grinnell

   Grinnell licensed a sprinkler device patented by Henry S. Parmalee, then worked to improve the invention, and in 1881 patented the automatic sprinkler that bears his name. [2] He continued to improve the device and in 1890 invented the glass disc sprinkler, essentially the same as that in use today. Such sprinklers are called le Grinnell in ...

6. Fire sprinkler system - Wikipedia

   en.wikipedia.org/wiki/Fire_sprinkler_system

   A fire sprinkler system is an active fire protection method, consisting of a water supply system providing adequate pressure and flowrate to a water distribution piping system, to which fire sprinklers are connected. Although initially used only in factories and large commercial buildings, systems for homes and small buildings are now available ...

7. Category:Companies based in Chicago - Wikipedia

   en.wikipedia.org/wiki/Category:Companies_based...

   Newspaper companies in Chicago (1 C, 5 P) O. Opera companies in Chicago (1 C, 13 P) R. RR Donnelley (8 P) S. Shopping malls in Chicago (19 P) Small businesses in ...