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 7035-01-395-7606
NSN 5930-01-289-2097
NSN 5935-01-224-7503
NSN 4140-01-079-6886
NSN 7035-01-216-4806
NSN 6685-00-712-9616
NSN 5905-01-561-6503
NSN 5999-01-388-2942
NSN 5998-01-602-2521
NSN 5910-01-252-8659
NSN 5930-01-055-6328
NSN 5935-01-468-6032