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 6320-01-377-0033
NSN 5965-01-147-5847
NSN 5996-00-953-5126
NSN 5999-00-837-6785
NSN 4140-01-130-6237
NSN 5996-00-648-6580
NSN 6110-01-512-9520
NSN 6645-01-480-7819
NSN 5895-01-605-3311
NSN 5975-00-269-4365
NSN 5855-01-417-3250
NSN 6130-01-191-1959