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 6620-00-684-3425
NSN 6620-00-786-7049
NSN 5985-01-348-8760
NSN 5930-00-216-7511
NSN 6240-01-515-2400
NSN 6105-00-822-9483
NSN 6110-00-520-2681
NSN 6620-00-342-9843
NSN 5975-00-207-3416
NSN 5960-00-010-5300
NSN 5960-01-090-9291
NSN 5945-00-039-6959