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 5835-01-123-8305
NSN 5996-00-080-7675
NSN 5855-01-218-3735
NSN 5996-00-786-7968
NSN 5996-01-056-4952
NSN 5905-01-116-9985
NSN 5945-01-221-5403
NSN 5930-00-479-9984
NSN 6135-01-162-0943
NSN 5998-01-413-9534
NSN 5990-00-754-2842
NSN 5950-00-433-2451