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 5945-00-964-5358
NSN 6650-00-003-5413
NSN 5915-01-092-5279
NSN 5935-01-399-8655
NSN 5930-00-312-4223
NSN 5905-00-097-7631
NSN 5999-01-142-2608
NSN 5950-01-655-9151
NSN 5996-01-022-9447
NSN 6645-01-612-6885
NSN 5910-00-707-4900
NSN 6220-00-212-9098