A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5915-01-113-4366
NSN 6240-01-557-7463
NSN 2925-01-262-1418
NSN 5985-00-928-3713
NSN 6650-01-112-0453
NSN 6645-01-386-6311
NSN 6645-01-443-4854
NSN 5915-01-259-3385
NSN 5960-01-331-3817
NSN 6610-00-848-4764
NSN 6650-01-474-6889
NSN 6645-01-314-1776