| Tariff Classification |
| section 18 | Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; clocks and watches; musical instruments; parts and accessories thereof |
| chapter 90 | Optical, photographic, cinematographic, measuring, checking, precision, medical or surgical instruments and apparatus; parts and accessories thereof |
| 90.14 | Direction finding compasses; other navigational instruments and appliances: |
| 9014.20 | －Instruments and appliances for aeronautical or space navigation (other than compasses) |
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