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 5999-01-626-9000
NSN 5915-00-456-2227
NSN 6110-00-973-0416
NSN 6645-00-204-4100
NSN 6610-01-202-0371
NSN 6135-00-110-1981
NSN 5905-01-112-0271
NSN 5960-00-072-5874
NSN 6135-01-437-7741
NSN 5965-00-267-4173
NSN 2925-01-389-1683
NSN 5925-01-480-6701