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 5960-01-408-3702
NSN 5945-01-569-6674
NSN 6105-00-104-5306
NSN 5975-00-395-9852
NSN 5996-00-185-1372
NSN 6645-01-550-9669
NSN 5965-01-117-2566
NSN 5960-00-553-7338
NSN 5990-01-615-7823
NSN 5975-00-955-2224
NSN 5895-00-519-7543
NSN 4140-00-078-9357