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 5945-01-591-7036
NSN 6645-01-189-6942
NSN 6135-01-643-9081
NSN 5915-01-103-0823
NSN 5930-00-189-2745
NSN 5910-00-608-3413
NSN 5999-01-004-3383
NSN 6130-01-133-0848
NSN 5925-01-391-8077
NSN 6610-01-463-8866
NSN 5895-00-288-1798
NSN 5930-00-568-1016