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 5975-00-393-2097
NSN 5930-01-025-6151
NSN 5960-00-706-5439
NSN 5960-00-400-7693
NSN 5996-00-056-5150
NSN 6240-01-483-7761
NSN 6110-00-984-4273
NSN 6150-01-296-4906
NSN 5985-01-497-6248
NSN 5965-01-411-9933
NSN 6610-00-548-3452
NSN 5990-01-108-7785