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 5985-01-462-8699
NSN 6645-01-186-9809
NSN 5996-00-740-8315
NSN 6220-01-383-1523
NSN 6650-01-288-8279
NSN 2925-00-146-0179
NSN 6650-01-517-9452
NSN 6110-01-054-1234
NSN 5985-01-430-4294
NSN 6240-00-275-1950
NSN 5965-01-421-7273
NSN 6650-00-597-7313