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 5925-00-869-1175
NSN 5975-01-599-2345
NSN 6105-01-534-9701
NSN 6620-01-524-0583
NSN 5915-01-301-6787
NSN 4140-01-285-3348
NSN 6610-01-212-2969
NSN 6220-01-145-4993
NSN 5905-00-212-4936
NSN 5920-00-427-7267
NSN 5915-01-279-6813
NSN 5855-00-281-3843