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 2925-00-149-0760
NSN 5999-01-481-0132
NSN 5905-01-256-6721
NSN 5999-00-272-2175
NSN 5895-00-050-6612
NSN 6320-01-512-2031
NSN 5999-01-464-3899
NSN 5855-01-634-0259
NSN 6145-00-296-0085
NSN 5975-01-569-2490
NSN 5945-01-086-7594
NSN 6130-01-416-2080