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.
NSN 5920-01-577-2346
NSN 5998-00-695-4920
NSN 6220-01-593-5083
NSN 5945-01-490-5722
NSN 5998-01-445-5078
NSN 5920-01-513-9340
NSN 5975-01-459-7763
NSN 6610-00-822-0431
NSN 6645-01-083-4759
NSN 5975-00-170-3623
NSN 6110-00-630-1074
NSN 5920-01-429-9947