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 6220-00-111-0921
NSN 6620-01-475-3472
NSN 5910-00-679-9473
NSN 5855-00-237-4088
NSN 6130-00-111-1320
NSN 5998-01-490-9818
NSN 6240-00-059-4637
NSN 5910-00-169-7245
NSN 6610-00-783-8786
NSN 5835-00-104-8944
NSN 6220-01-186-5930
NSN 6150-00-258-3761