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 6620-00-627-3688
NSN 5960-01-281-5437
NSN 5920-01-634-0250
NSN 5925-00-431-3256
NSN 6145-01-632-0742
NSN 2925-00-596-9775
NSN 5990-00-623-8127
NSN 6145-01-171-0719
NSN 5895-01-297-8626
NSN 6685-01-029-1144
NSN 5935-00-203-5852
NSN 5975-01-103-2998