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 6105-01-415-4844
NSN 5925-01-352-7737
NSN 5950-01-453-1770
NSN 6105-00-647-3955
NSN 5990-00-288-1820
NSN 5999-01-431-7323
NSN 5996-00-613-1761
NSN 5965-00-936-4428
NSN 6320-01-459-6992
NSN 6130-01-126-8420
NSN 6610-01-145-2569
NSN 4140-01-519-9343