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 5960-00-099-9790
NSN 5910-01-522-4920
NSN 5855-01-158-2709
NSN 6150-00-097-6136
NSN 5915-01-474-8187
NSN 6150-01-090-3406
NSN 4140-01-432-8726
NSN 6220-00-415-7078
NSN 5985-00-481-8114
NSN 5999-01-122-1816
NSN 5835-01-215-5961
NSN 6150-00-390-3422