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 6620-00-836-0399
NSN 5985-01-639-8150
NSN 5930-01-444-2222
NSN 5985-01-552-4379
NSN 5855-01-445-6551
NSN 5985-01-075-8575
NSN 5930-00-202-1078
NSN 5985-00-910-2558
NSN 5999-00-569-4756
NSN 5905-00-290-8098
NSN 5910-00-827-0762
NSN 5915-01-251-9564