Model: 521D28
Observation WindowProperties:
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.
Part 521D28 NSN 9330-00-881-6358
Material Classification
Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicatorsFreight Classification
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Schedule B and Export
- Schedule B: 3926909987
- SITC: 89399
- End Use: Other industrial supplies
- NAICS: 326199
- USDA: 1
Freight Class: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
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