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 6220-00-448-9600
NSN 5999-00-428-2007
NSN 4140-00-888-9836
NSN 6620-01-632-7669
NSN 6320-00-456-2092
NSN 5950-01-015-6059
NSN 5985-00-387-5974
NSN 5996-01-528-2506
NSN 6685-00-383-6712
NSN 5835-01-321-2906
NSN 7035-00-946-2642
NSN 5998-01-237-1898