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 5985-01-564-2009
NSN 6130-00-110-1746
NSN 7035-01-658-1623
NSN 5915-01-577-1682
NSN 6320-01-176-8367
NSN 5915-01-142-2018
NSN 4140-01-517-5462
NSN 5950-00-019-8503
NSN 6150-01-650-3824
NSN 5930-01-523-1060
NSN 6150-01-487-8418
NSN 5950-00-863-8959