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 5998-00-823-5659
NSN 2925-00-156-8963
NSN 6150-01-281-3653
NSN 6320-00-593-0379
NSN 6105-01-273-6062
NSN 5999-01-398-0077
NSN 4140-01-060-1438
NSN 5925-00-762-0909
NSN 5945-00-682-4375
NSN 5998-01-102-9424
NSN 5895-00-760-9236
NSN 6620-00-137-0332