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 6320-00-110-8005
NSN 5895-00-878-7768
NSN 5975-00-782-8890
NSN 6650-01-131-5318
NSN 5999-00-852-0180
NSN 5975-00-342-2262
NSN 4140-00-170-1567
NSN 5999-01-516-7166
NSN 5910-00-149-2016
NSN 5975-00-471-3731
NSN 5945-01-457-9831
NSN 5910-01-612-1778