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 5905-00-518-7020
NSN 5930-01-338-5494
NSN 6135-00-767-0331
NSN 5905-01-308-9974
NSN 5950-01-634-0677
NSN 6105-00-235-6451
NSN 5965-01-416-4059
NSN 5895-01-023-0522
NSN 5905-00-848-7604
NSN 5960-01-391-4701
NSN 5985-01-183-4132
NSN 6150-01-454-1111