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 5975-01-199-9382
NSN 5999-00-100-5761
NSN 5930-01-157-8917
NSN 6645-01-654-2727
NSN 5960-01-009-2899
NSN 5920-01-562-9513
NSN 4140-01-545-7754
NSN 6150-01-135-4320
NSN 5855-01-381-5324
NSN 6645-00-017-8252
NSN 5835-01-279-9508
NSN 6145-01-301-6015