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 5910-01-054-6160
NSN 5950-00-840-5677
NSN 6130-01-067-0786
NSN 5935-00-381-5772
NSN 5895-01-394-0678
NSN 5935-01-387-1334
NSN 6220-00-483-4044
NSN 5945-00-144-8073
NSN 5960-01-580-6360
NSN 5950-01-390-0349
NSN 6110-01-550-0169
NSN 7035-01-338-2994