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 5925-00-622-2294
NSN 6145-01-528-7853
NSN 6150-00-728-5972
NSN 5975-00-761-0206
NSN 6320-01-259-2604
NSN 5999-01-597-0412
NSN 6685-01-004-6182
NSN 7035-00-922-5700
NSN 6620-01-270-6619
NSN 5999-01-451-1455
NSN 6320-01-539-4789
NSN 5935-01-452-5502