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 5905-00-339-8045
NSN 6145-01-096-6848
NSN 6685-01-205-5292
NSN 5895-01-104-3815
NSN 5910-01-311-6260
NSN 5975-01-299-3356
NSN 5965-00-060-0090
NSN 5935-01-298-0441
NSN 5930-01-340-0900
NSN 5930-00-629-4439
NSN 5999-01-083-3947
NSN 5930-00-615-5335