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 5998-01-033-8285
NSN 2925-00-520-9546
NSN 5999-01-215-0939
NSN 6130-01-621-5665
NSN 7035-01-633-3508
NSN 6620-01-104-5510
NSN 6130-01-442-7499
NSN 5920-01-310-6027
NSN 5998-01-574-3389
NSN 5996-00-336-3046
NSN 5925-01-083-6500
NSN 5920-01-220-8229