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 2925-01-340-5504
NSN 4140-01-492-8416
NSN 5895-01-551-5484
NSN 5990-01-386-5561
NSN 6650-01-528-8230
NSN 6610-00-350-1091
NSN 5925-00-892-1115
NSN 5930-00-013-4201
NSN 5999-00-628-7858
NSN 5925-00-018-9198
NSN 5835-01-163-4215
NSN 5930-00-239-2150