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 5905-00-442-4896
NSN 5925-00-459-9002
NSN 6645-01-031-6402
NSN 5965-00-529-0602
NSN 5935-01-437-7456
NSN 5996-01-310-8974
NSN 5920-00-761-0134
NSN 6240-00-627-9007
NSN 5855-01-013-6864
NSN 4140-01-447-3141
NSN 6650-01-649-0228
NSN 6645-01-461-7704