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.
Combustion safety testing is required by code (NFPA 54) for natural draft appliances using indoor or outdoor air for combustion and flue gas dilution to ensure safe operation. The U.S. Department of Energy (DOE) Zero Energy Ready Home Program requires that builders comply with EPAâs Indoor airPLUS Program.