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 5855-01-096-9294
NSN 6685-00-753-2896
NSN 5935-00-137-7246
NSN 6240-01-301-2004
NSN 5910-01-251-1267
NSN 7035-01-514-8522
NSN 4140-01-378-8390
NSN 2925-01-429-2235
NSN 5920-01-401-5315
NSN 5855-00-411-8688
NSN 5910-01-535-1028
NSN 7035-00-392-5417