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 6610-01-524-0636
NSN 6620-01-498-4780
NSN 4140-00-968-7367
NSN 5915-01-219-8136
NSN 6105-01-149-2852
NSN 2925-01-474-3363
NSN 5935-00-244-7470
NSN 5999-01-194-9899
NSN 6130-01-014-5419
NSN 5835-01-232-4035
NSN 6150-01-242-7902
NSN 5965-01-564-3579