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 6610-01-197-9639
NSN 2925-01-509-3783
NSN 5950-00-337-3488
NSN 5925-01-289-5871
NSN 6220-00-706-0073
NSN 5855-01-351-8909
NSN 6110-00-449-6269
NSN 6650-00-197-7563
NSN 5960-01-359-4257
NSN 5950-00-876-9357
NSN 5910-01-468-1112
NSN 5925-01-246-6915