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POSIX
Creation, Control, and Cleanup Thread Scheduling Thread Synchronization Signal Handling POSIX.2 - Shell and Utilities (IEEE Std 1003.2-1992) Command Interpreter
“The History of Astronautics Corporation of America”. Astronautics. December 16, 2016閲覧。 ^ "Federal Signal Corporation Announces Board of Director Changes:
com/new-york/ny-metro-subway-signal-timers-20181026-story.html November 8, 2018閲覧。 ^ a b Martinez, Jose (November 8, 2018). “How the MTA is Clocking Signal Timers To Speed
2011. 2011年5月6日閲覧。 ^ "FM Query". Federal Communications Commission. 6 May 2011. 2011年5月6日閲覧。 ^ "AM Query". Federal Communications Commission. 6 May 2011
Television Stations”. Federal Communications Commission (FCC) (December 4, 2014). 13 December 2014閲覧。 ^ “FCC Broadcast Actions”. Federal Communications Commission