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 5910-01-117-7414
NSN 7035-01-301-3263
NSN 5835-01-209-6410
NSN 4140-01-540-7357
NSN 5950-00-632-0280
NSN 5925-01-026-0891
NSN 6240-00-155-8002
NSN 6685-00-958-0065
NSN 4140-00-371-2269
NSN 5999-01-579-0593
NSN 5965-01-051-3727
NSN 5910-01-236-0823