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 6145-00-233-5450
NSN 6130-01-099-3939
NSN 5905-01-427-3804
NSN 5910-01-658-7939
NSN 6610-00-337-5483
NSN 6650-01-394-6894
NSN 6620-01-435-2784
NSN 6220-01-079-7772
NSN 5996-01-519-3843
NSN 5895-01-248-9367
NSN 5999-01-499-1868
NSN 5925-01-640-7347