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 5855-00-797-8217
NSN 5905-01-201-3547
NSN 6620-01-268-9693
NSN 6130-00-457-0593
NSN 5855-00-885-8452
NSN 5930-01-406-4168
NSN 6320-01-497-3116
NSN 5965-01-530-8875
NSN 6135-01-260-7180
NSN 5960-01-058-8582
NSN 6650-00-832-6970
NSN 5999-00-765-3035