Hardness critical item
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 5960-00-188-8648
NSN 6220-01-396-7636
NSN 6110-01-103-8284
NSN 6645-00-256-4072
NSN 6220-01-027-4223
NSN 7035-01-070-3143
NSN 5965-00-752-5823
NSN 5835-01-535-0948
NSN 5920-00-575-8826
NSN 6685-00-638-9261
NSN 4140-01-220-1408
NSN 5985-01-515-2994