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 5985-00-727-4376
NSN 5975-01-660-8493
NSN 5985-01-012-8837
NSN 5895-01-382-1110
NSN 6685-00-225-8571
NSN 5998-00-467-1932
NSN 5975-01-323-5876
NSN 5965-01-534-6396
NSN 5925-00-137-1130
NSN 5945-00-244-3319
NSN 5930-00-975-1779
NSN 6610-00-836-9437