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 5960-01-301-3315
NSN 5920-01-109-1875
NSN 6650-01-040-3958
NSN 5965-01-306-6527
NSN 5996-01-440-9660
NSN 6610-01-390-6925
NSN 5855-00-179-8588
NSN 2925-01-311-7840
NSN 5910-01-229-5558
NSN 5945-01-595-6691
NSN 5999-01-099-6962
NSN 5855-01-400-1590