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 6150-01-025-6083
NSN 6685-01-375-8909
NSN 5999-00-879-4069
NSN 4140-01-400-3610
NSN 5925-00-646-6761
NSN 5990-00-756-2555
NSN 6130-01-322-8507
NSN 5915-01-659-8571
NSN 2925-01-100-3694
NSN 5935-01-027-1449
NSN 5990-00-902-7764
NSN 5910-01-581-1270