Hardness critical item
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.
Classification: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 6110-00-575-9795
NSN 6610-01-014-3964
NSN 2925-00-071-4197
NSN 6610-00-448-9004
NSN 6610-01-514-5928
NSN 6220-00-062-7029
NSN 6110-00-021-6696
NSN 5925-00-299-8037
NSN 6220-01-381-0081
NSN 6145-01-314-8534
NSN 5985-01-350-3454
NSN 5910-00-920-0483