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 5945-01-362-8841
NSN 5998-00-653-8168
NSN 6130-01-044-1888
NSN 6110-00-156-0430
NSN 7035-00-803-3056
NSN 6685-00-319-8882
NSN 5960-01-142-1995
NSN 6130-01-516-2690
NSN 6240-00-167-2467
NSN 6135-00-603-4859
NSN 5930-01-160-7126
NSN 4140-01-320-1179