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 6145-01-045-2594
NSN 5855-00-149-0766
NSN 4140-01-132-0093
NSN 5905-01-099-9496
NSN 4140-01-497-2716
NSN 5999-00-908-4118
NSN 6645-01-073-5302
NSN 6145-01-649-9619
NSN 2925-01-460-1601
NSN 6320-01-166-3602
NSN 5920-00-510-7656
NSN 6610-01-382-1881