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 5925-00-550-4946
NSN 6220-01-607-0130
NSN 5930-00-115-7265
NSN 5985-01-176-8806
NSN 6130-00-134-0266
NSN 5835-01-623-3328
NSN 6240-01-244-2014
NSN 5925-01-447-4153
NSN 5950-01-600-1773
NSN 5950-00-964-5733
NSN 5905-00-314-3340
NSN 7035-01-632-0011