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 6685-00-075-5613
NSN 6610-01-218-2937
NSN 6110-00-787-2074
NSN 6685-01-116-3422
NSN 6320-01-134-7267
NSN 5945-01-308-7948
NSN 5935-01-191-2921
NSN 5935-01-424-5773
NSN 6105-01-137-6000
NSN 6685-00-126-3741
NSN 5975-01-512-1419
NSN 6240-00-519-3399