Origin [edit]. The systematic use of belt color to denote the rank was first used by Kano Jigoro, the founder of judo, who first devised the colored belt system using obi (sash), and awarded the first black belts to denote a Dan rank in the 1880s. Previously, Japanese Koryu instructors tended to provide certificates.
Everything for a safe and comfortable trip. Air safety is the theory, investigation, analysis, and categorization of flight failures (aircraft incidents and accidents), and the prevention of such failures through regulation, education and training.
Smoke Detection. National and local safety. standards and codes recognize the ability of air duct sys-. tems to transfer smoke, toxic gases, and flame from area to. area. Sometimes smoke can be of such quantity as to be a. serious hazard to life safety unless blowers are shut down. and dampers are actuated.