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 5985-01-062-1328
NSN 7035-01-381-6185
NSN 5930-01-351-8047
NSN 5925-00-931-7935
NSN 5950-01-595-4952
NSN 5950-01-604-8158
NSN 6650-01-010-0107
NSN 5990-01-116-2181
NSN 6150-00-549-2427
NSN 5945-01-187-9245
NSN 6610-01-453-4269
NSN 5998-01-500-1995