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2. USG Corporation - Wikipedia

   en.wikipedia.org/wiki/USG_Corporation

   USG Corporation, also known as United States Gypsum Corporation, is an American company which manufactures construction materials, most notably drywall and joint compound. The company is the largest distributor of wallboard in the United States and the largest manufacturer of gypsum products in North America.

3. USG and GE Lighting Collaborate to Offer Monolithic ...

   www.aol.com/news/2012-10-16-usg-and-ge-lighting...

   USG and GE Lighting Collaborate to Offer Monolithic, Sustainable Integrated Ceiling and Lighting System CHICAGO--(BUSINESS WIRE)-- USG Corporation (NYS: USG) , a leading building products company ...

4. Dropped ceiling - Wikipedia

   en.wikipedia.org/wiki/Dropped_ceiling

   A dropped ceiling is a secondary ceiling, hung below the main (structural) ceiling. It may also be referred to as a drop ceiling, T-bar ceiling, false ceiling, suspended ceiling, grid ceiling, drop in ceiling, drop out ceiling, or ceiling tiles and is a staple of modern construction and architecture in both residential and commercial applications.

5. Troffer - Wikipedia

   en.wikipedia.org/wiki/Troffer

   A troffer is a rectangular light fixture that fits into a modular dropped ceiling grid (i.e. 2' by 2' or 2' by 4'). Troffer fixtures have typically been designed to accommodate standard fluorescent lamps (T12, T8, or T5), but are now often designed with integral LED sources. Troffers are typically recessed sitting above the ceiling grid, but ...

6. USG - Wikipedia

   en.wikipedia.org/wiki/USG

   USG may refer to: Business. Unix Systems Group, a former division of Novell; USG Corporation (formerly United States Gypsum Corporation), a construction materials ...

7. North American power transmission grid - Wikipedia

   en.wikipedia.org/wiki/North_American_power...

   The electric power transmission grid of the contiguous United States consists of 120,000 miles (190,000 km) of lines operated by 500 companies. The electrical power grid that powers Northern America is not a single grid, but is instead divided into multiple wide area synchronous grids . [ 1 ]