Where is the company, which built the roller coaster Comet, based?
Philadelphia Toboggan Coasters Philadelphia Toboggan Coasters, commonly referred to as PTC, is one of the oldest existing roller coaster manufacturing companies in the world. Based in Hatfield, Pennsylvania, it was established in 1904 by Henry Auchey and Chester Albright under the name Philadelphia Toboggan Company. The company manufactured carousels, wooden roller coasters, toboggans (roller coaster cars) and later, roller coaster trains.
Sierra Entertainment Sierra Entertainment, Inc. (formerly On-Line Systems and later Sierra On-Line, Inc.) was an American video game publisher based in Bellevue, Washington.