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 6620-00-264-8030
NSN 5999-01-452-7170
NSN 6610-01-646-9101
NSN 5905-01-617-1816
NSN 5975-00-111-6781
NSN 5950-01-519-3948
NSN 6220-00-593-9571
NSN 5895-01-132-8803
NSN 6110-01-142-0633
NSN 5905-01-197-5427
NSN 6645-01-633-1852
NSN 6130-00-480-1244