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 6610-01-322-4331
NSN 5975-01-034-8264
NSN 6110-00-905-6148
NSN 6220-00-233-7436
NSN 5990-01-193-0487
NSN 5998-01-398-9025
NSN 6240-01-484-0335
NSN 6240-01-341-6579
NSN 5975-01-603-3614
NSN 2925-00-428-6349
NSN 6240-01-196-0497
NSN 4140-00-170-5152