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 6105-00-284-7642
NSN 6150-01-376-8061
NSN 5855-01-407-2300
NSN 5930-00-910-7439
NSN 5975-01-380-1908
NSN 5895-00-242-4273
NSN 5920-01-487-8597
NSN 6240-00-313-2515
NSN 5960-01-323-6432
NSN 6645-01-087-7345
NSN 5855-00-631-4565
NSN 5985-01-023-7701