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 6240-01-442-6770
NSN 5895-01-422-0954
NSN 5910-00-168-9650
NSN 6620-01-169-9470
NSN 7035-01-106-3476
NSN 5985-01-252-1818
NSN 5855-01-366-2429
NSN 5998-01-165-1677
NSN 4140-01-105-7586
NSN 6240-01-433-9410
NSN 5965-00-035-4556
NSN 6645-00-491-8963