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 5975-01-451-4192
NSN 6130-01-270-1395
NSN 5996-01-353-8017
NSN 6610-01-018-4428
NSN 5960-01-449-1310
NSN 6240-01-374-1904
NSN 5935-00-541-0722
NSN 6105-00-474-5177
NSN 5985-00-850-8283
NSN 5935-01-145-4512
NSN 5990-01-058-4826
NSN 5930-00-833-6704