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Semaphore Semaphore (tin học) Semaphore (định hướng) SemaphoraTài liệu tham khảo
WikiPedia: Semaphore http://www.wxs.ca/applets/semaphore http://www.du.edu/~jcalvert/railway/railhom.htm#hi... http://people.deas.harvard.edu/~jones/cscie129/ima... http://labit501.upct.es/ips/libros/TEHODN/ch-2-5.3... http://www.royal-signals.org.uk/telegraph.php http://www.vauxhallandkennington.org.uk/telegraph.... https://commons.wikimedia.org/wiki/Category:Optica...