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 5999-00-463-3216
NSN 5996-01-369-2678
NSN 6650-01-157-1667
NSN 5996-01-063-8822
NSN 5998-01-272-4314
NSN 6240-01-217-8287
NSN 5985-01-065-0449
NSN 6645-01-433-1398
NSN 5960-01-564-5044
NSN 5985-00-233-5773
NSN 5999-01-578-0625
NSN 6110-01-067-3741