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 5905-01-324-8955
NSN 5925-00-910-0033
NSN 5999-01-495-0998
NSN 5985-00-148-6008
NSN 5855-01-519-7929
NSN 5999-01-162-2981
NSN 5930-01-073-7798
NSN 5930-01-304-1856
NSN 6320-01-344-6511
NSN 6240-00-660-8849
NSN 6145-01-122-3318
NSN 5905-01-006-0436