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 5855-01-418-6303
NSN 5910-01-301-2575
NSN 5990-01-612-5323
NSN 5945-00-898-7807
NSN 5935-00-205-9563
NSN 5985-01-315-0552
NSN 5985-01-204-4503
NSN 6620-01-468-6017
NSN 6685-01-641-8920
NSN 5920-01-534-2270
NSN 5920-01-572-3960
NSN 6610-01-360-3564