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 5999-01-406-4124
NSN 5965-01-322-8136
NSN 5930-01-089-8615
NSN 5930-00-959-3176
NSN 6240-01-052-2488
NSN 5920-01-014-3939
NSN 5945-01-350-5364
NSN 5985-01-469-6959
NSN 5950-01-386-4012
NSN 6685-01-115-3953
NSN 5990-00-464-6385
NSN 6150-01-432-7053