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 6620-01-515-9597
NSN 6320-00-937-5625
NSN 6610-01-112-8137
NSN 5999-00-113-9325
NSN 6240-00-097-8505
NSN 6130-00-115-9306
NSN 5975-00-274-5720
NSN 5930-01-105-1762
NSN 5965-01-396-7508
NSN 6150-01-502-5500
NSN 5925-01-262-0759
NSN 5996-01-386-7421