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 5998-00-145-2787
NSN 6135-00-826-4798
NSN 5985-00-367-2711
NSN 5915-00-170-6775
NSN 5920-01-123-9854
NSN 5996-00-847-8342
NSN 6650-01-107-7553
NSN 6150-00-342-9765
NSN 6645-01-211-6502
NSN 6650-01-633-5160
NSN 5985-00-879-1923
NSN 5915-01-354-1092