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 6110-00-021-0925
NSN 6620-01-376-3744
NSN 6135-00-542-6728
NSN 5945-01-120-0515
NSN 5920-01-129-9724
NSN 2925-00-233-5644
NSN 5945-01-106-4558
NSN 5895-01-445-6161
NSN 5895-00-799-5528
NSN 5905-00-926-8827
NSN 5996-01-519-3843
NSN 5975-01-438-4859