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 5950-01-654-0634
NSN 6145-01-030-4338
NSN 5915-00-840-7323
NSN
NSN 7035-01-418-5499
NSN 5998-00-221-7502
NSN 5999-01-318-5781
NSN 6620-01-203-4369
NSN 5895-01-454-9440
NSN 5895-01-056-4548
NSN 6645-01-227-0438
NSN 5975-01-516-8985