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 5930-00-138-7259
NSN 6620-01-039-5468
NSN 5996-01-320-2301
NSN 5950-01-503-0747
NSN 6145-00-493-4073
NSN 5975-00-077-9055
NSN 5960-01-480-0994
NSN 6135-00-880-1026
NSN 7035-01-065-3744
NSN 5910-01-648-2045
NSN 6610-01-470-7360
NSN 5945-01-233-5810