You must pass two qualifying exams in orthodontic assisting and infection control to become a Certified Orthodontic Assistant. As of April 2011, DANB certification for OAs was recognized in 38 states and required in four - Massachusetts, Maryland, New Jersey and Oregon.
American Standard Companies, Inc. was a global manufacturer of plumbing, heating, ventilating and air conditioning (HVAC) systems and services, bath and kitchen products and vehicle control systems.he company was formed in 1929 through the merger of the American Radiator Company and Standard Sanitary Manufacturing Company forming the American Radiator and Standard Sanitary Corporation. The group was renamed to the American Standard Corporation in 1967.
HVAC products became Tappan Air Conditioning division in 1972. American Standard purchased the Trane Company in 1984, American Standard name revived in 1988. In 2007 all but HVAC sold off, corporate name changed to Trane. Trane was them purchased by Ingersoll Rand.dditions and corrections welcome! AAON: Started as John Zink in 1928, purchased by Sunbeam then Allegheny International. In 1988 AAON was formed to by the HVAC products company from Allegheny. AMANA: Amana Refrigeration started in 1934 in the Amana Colonies IA.