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 6130-00-718-0860
NSN 5935-01-445-5917
NSN 5965-00-805-4893
NSN 6610-01-116-2527
NSN 5999-01-501-0694
NSN 6110-01-606-8699
NSN 6685-01-617-8287
NSN 6685-01-356-5930
NSN 5920-01-292-7625
NSN 4140-01-168-8796
NSN 5925-01-099-9542
NSN 5945-01-597-6305