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 6620-00-155-2608
NSN 6650-00-004-3683
NSN 7035-01-412-8322
NSN 6240-00-734-3276
NSN 5965-01-406-3156
NSN 5945-01-046-2806
NSN 5930-00-932-3143
NSN 5910-01-097-9315
NSN 5960-00-752-6175
NSN 5905-00-137-5311
NSN 6610-01-299-1713
NSN 5990-01-240-7288