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 5920-00-507-5105
NSN 5965-01-238-3900
NSN 6150-00-079-1101
NSN 6685-01-578-7011
NSN 5960-00-710-9818
NSN 6220-00-333-8521
NSN 5925-01-478-2656
NSN 6240-01-425-1545
NSN 5975-01-392-0436
NSN 5855-01-344-8688
NSN 5920-00-252-2627
NSN 5910-01-445-6355