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 6110-00-304-7201
NSN 5910-01-449-0427
NSN 6650-01-014-5990
NSN 5990-01-231-1214
NSN 6650-01-544-7205
NSN 6135-00-519-1325
NSN 5925-01-574-2048
NSN 5950-00-500-4198
NSN 5996-01-426-8531
NSN 6620-01-411-0390
NSN 5915-00-509-7309
NSN 5895-00-115-9236