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 6650-01-291-5024
NSN 6620-01-401-5356
NSN 5985-01-227-8717
NSN 5930-01-314-7321
NSN 5910-00-847-0029
NSN 6620-01-524-0583
NSN 6135-01-560-8130
NSN 5930-01-337-7917
NSN 6110-01-351-3940
NSN 2925-00-465-6354
NSN 5905-00-278-5764
NSN 5985-00-097-6317