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 6105-00-128-9951
NSN 2925-01-575-3192
NSN 5999-01-386-9711
NSN 6240-01-551-1722
NSN 5905-01-444-4160
NSN 6650-00-234-3275
NSN 5999-01-535-7356
NSN 6620-00-175-0663
NSN 6105-01-544-0297
NSN 6650-01-145-9570
NSN 4140-01-188-6977
NSN 5925-00-666-4753