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 5895-01-412-0950
NSN 4140-01-617-3290
NSN 5999-00-103-5287
NSN 5996-01-386-4230
NSN 5935-00-334-0401
NSN 6645-00-171-5354
NSN 5930-01-649-5597
NSN 6135-01-324-7718
NSN 5998-01-010-2809
NSN 5925-01-613-5869
NSN 6650-00-647-1085
NSN 5975-01-573-2198