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 5960-01-506-7039
NSN 5985-00-475-8106
NSN 6110-01-567-2055
NSN 5910-00-601-6404
NSN 6220-01-377-4957
NSN 5925-01-009-4054
NSN 5985-00-736-6073
NSN 5960-00-621-8563
NSN 5930-01-029-5218
NSN 6220-00-088-0580
NSN 5905-00-448-6558
NSN 5999-01-495-4041