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 6145-01-445-1658
NSN 5985-00-480-1904
NSN 6320-01-364-1840
NSN 5998-01-599-9907
NSN 5855-00-944-0949
NSN 5920-01-244-4987
NSN 6685-01-301-3721
NSN 5895-00-515-6368
NSN 5990-00-960-6310
NSN 4140-01-206-4430
NSN 5920-01-422-1866
NSN 5915-01-657-9803