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 6150-00-470-7136
NSN 5965-01-057-7719
NSN 6240-00-827-5794
NSN 6685-00-756-3137
NSN 5855-01-138-4985
NSN 5895-01-009-3134
NSN 6650-01-087-7665
NSN 4140-01-145-4474
NSN 6220-01-034-1231
NSN 5910-01-541-5046
NSN 4140-01-285-1336
NSN 6110-00-188-9874