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 6220-01-193-7577
NSN 6645-01-337-1806
NSN 6650-01-169-4327
NSN 5945-01-230-8262
NSN 5999-00-231-4632
NSN 5855-01-444-4228
NSN 5895-01-551-8824
NSN 6320-01-449-1014
NSN 6620-00-118-1983
NSN 7035-00-849-5526
NSN 5950-00-597-3661
NSN 6150-00-604-9499