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 2925-01-161-2325
NSN 6610-00-150-6408
NSN 5905-01-498-5063
NSN 5996-00-142-5697
NSN 5915-00-556-2189
NSN 6610-00-419-0315
NSN 5950-01-141-2900
NSN 6135-01-450-3781
NSN 5895-00-009-9152
NSN 6220-00-254-0427
NSN 5960-01-190-2996
NSN 6240-01-633-9357