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 6685-00-138-0692
NSN 5960-01-605-9921
NSN 6105-01-518-6341
NSN 5855-00-560-0110
NSN 5998-01-578-7901
NSN 6620-01-589-5411
NSN 5945-00-490-8863
NSN 5915-01-365-3651
NSN 5915-01-093-6414
NSN 5925-00-377-6368
NSN 2925-01-320-6512
NSN 6620-00-980-0244