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 6645-01-513-0117
NSN 6220-00-741-1002
NSN 5915-00-216-3347
NSN 6105-01-497-7307
NSN 5935-00-543-3379
NSN 5920-01-581-4622
NSN 7035-01-476-7787
NSN 5985-01-026-9810
NSN 7035-00-890-7649
NSN 5999-01-125-3397
NSN 5920-00-411-5237
NSN 6320-01-305-5881