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 5998-01-091-0071
NSN 5999-01-260-9542
NSN 5965-01-082-3757
NSN 5950-01-037-6252
NSN 6105-01-365-9476
NSN 6135-00-299-6918
NSN 5965-01-458-8669
NSN 5935-01-433-5404
NSN 6685-00-578-5951
NSN 6220-00-212-9098
NSN 6145-00-581-1622
NSN 4140-01-586-5845