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 2925-01-197-7864
NSN 6150-01-342-1711
NSN 6650-01-428-9958
NSN 5998-01-367-0953
NSN 5910-01-035-9527
NSN 6610-01-633-8931
NSN 5996-01-475-3412
NSN 6645-01-301-9462
NSN 6220-01-435-4839
NSN 5990-01-372-1642
NSN 5998-00-015-3703
NSN 5998-00-938-7073