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 5960-00-188-8648
NSN 7035-01-271-1643
NSN 4140-00-202-7649
NSN 5930-01-437-9081
NSN 5895-00-114-0017
NSN 5990-01-434-7913
NSN 5965-00-139-4870
NSN 4140-01-044-3366
NSN 5999-01-333-3506
NSN 5910-01-556-4278
NSN 6620-01-658-8133
NSN 6645-01-123-9277