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| DG spin axis parallel to the earth; directional gyroscope spin axis parallel to the earth | |||
| eje de giro del giroscopio direccional paralelo a la Tierra: 3 phrases in 1 subject |
| Technology | 3 |
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| |||
| DG spin axis parallel to the earth; directional gyroscope spin axis parallel to the earth | |||
| eje de giro del giroscopio direccional paralelo a la Tierra: 3 phrases in 1 subject |
| Technology | 3 |