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 5990-01-421-5342
NSN 6240-00-201-9011
NSN 2925-01-458-5808
NSN 6150-00-116-5930
NSN 5920-00-761-5149
NSN 6220-00-185-6048
NSN 4140-01-418-0831
NSN 6110-01-104-4777
NSN 5895-01-368-2236
NSN 2925-00-728-8118
NSN 6145-01-148-7837
NSN 6145-01-091-7015