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 6650-01-537-2624
NSN 5910-01-435-6053
NSN 6610-01-115-5791
NSN 6110-00-663-4054
NSN 5920-01-474-5150
NSN 6645-01-467-9983
NSN 5999-00-863-0693
NSN 5935-01-080-8128
NSN 5905-01-068-2474
NSN 6620-01-498-4780
NSN 5835-01-064-0859
NSN 5960-01-528-1147