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 6685-00-252-3057
NSN 6650-01-553-2805
NSN 6240-01-078-9490
NSN 6220-01-427-2333
NSN 5990-00-116-6590
NSN 6130-01-013-8808
NSN 5835-01-235-5061
NSN 5915-01-166-7999
NSN 5915-01-507-4033
NSN 5925-00-533-1547
NSN 5996-01-146-4202
NSN 6650-01-393-4152