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 5998-01-343-3408
NSN 6620-00-724-1268
NSN 5895-01-215-2791
NSN 5996-01-425-9815
NSN 6320-01-560-7177
NSN 5990-00-538-7330
NSN 6150-00-407-1386
NSN 6110-01-254-7971
NSN 6240-00-347-7118
NSN 5910-00-410-0780
NSN 5910-01-045-0128
NSN 5985-00-869-9144