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 6320-01-232-4664
NSN 5998-01-161-2107
NSN 5950-01-393-3090
NSN 6685-01-549-6157
NSN 6240-01-152-1084
NSN 6130-01-573-7416
NSN 5935-01-073-7334
NSN 6145-01-026-2340
NSN 6610-01-039-9295
NSN 5990-00-088-7591
NSN 5998-00-391-8662
NSN 5925-01-381-0170