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 6650-01-135-5625
NSN 5945-01-431-5195
NSN 5960-01-632-6576
NSN 5999-00-419-0693
NSN 5915-00-469-3074
NSN 5990-01-156-7004
NSN 5999-01-400-3590
NSN 5925-01-603-3372
NSN 6220-00-018-4484
NSN 6240-01-580-6276
NSN 4140-01-538-6011
NSN 5920-01-031-1199