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 6150-00-150-8423
NSN 6105-01-428-4411
NSN 5945-00-259-5500
NSN 5835-00-466-8544
NSN 5925-00-035-8469
NSN 5960-00-280-4712
NSN 5990-01-231-1214
NSN 6645-00-159-8377
NSN 5965-01-512-0654
NSN 6320-00-382-7825
NSN 5925-00-230-8723
NSN 6645-00-033-8714