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 5855-01-149-4110
NSN 2925-01-423-8141
NSN 5910-01-561-2154
NSN 6240-01-496-5066
NSN 5975-00-636-4910
NSN 5996-01-534-3459
NSN 7035-01-074-2343
NSN 6135-00-962-4110
NSN 6150-01-627-8693
NSN 5950-00-711-1386
NSN 6645-01-050-5221
NSN 5985-00-126-6575