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 6620-01-212-8089
NSN 5855-01-278-4868
NSN 5960-01-599-9821
NSN 6110-00-961-1100
NSN 5950-01-259-5644
NSN 5835-00-009-2862
NSN 5855-01-325-9507
NSN 5895-01-521-9541
NSN 5915-00-707-2297
NSN 5950-00-903-7999
NSN 5925-01-603-3372
NSN 5910-01-400-0891