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 6135-00-196-5267
NSN 5960-01-094-5958
NSN 5998-01-559-3498
NSN 6240-01-505-5890
NSN 6105-00-815-7803
NSN 5835-00-562-7524
NSN 5895-00-567-9457
NSN 5910-01-109-5174
NSN 5975-01-048-3231
NSN 5960-01-341-5198
NSN 5930-01-595-6302
NSN 7035-00-337-8745