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 6130-00-753-7732
NSN 6150-01-609-3506
NSN 5996-01-454-6938
NSN 5855-01-434-7520
NSN 5945-00-639-9848
NSN 6145-00-435-9296
NSN 6105-00-339-4222
NSN 5975-00-443-5625
NSN 5925-01-127-9398
NSN 6150-01-297-8127
NSN 6220-01-166-4909
NSN 5835-01-332-2867