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 5895-01-373-3814
NSN 6620-01-449-6927
NSN 6320-01-230-8444
NSN 6610-01-180-2184
NSN 6220-01-585-4698
NSN 6610-01-200-6861
NSN 7035-01-606-9692
NSN 6145-01-444-9955
NSN 5835-00-614-0650
NSN 5935-00-250-6466
NSN 6145-01-399-0299
NSN 7035-01-026-0117