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 5990-00-825-7335
NSN 5935-01-620-9850
NSN 4140-01-258-4044
NSN 6320-01-149-7446
NSN 5915-01-341-9547
NSN 5905-01-327-0012
NSN 5835-00-145-8926
NSN 6145-01-417-5132
NSN 5975-01-633-3013
NSN 6220-00-823-6688
NSN 5910-00-611-4945
NSN 6220-01-412-7650