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| toroidal vacuum chamber | |||
| toroidal vessel; torus | |||
| doughnut; donut; toroid; vacuum doughnut (of a betatron or synchrotron); vacuum donut (of a betatron or synchrotron); circular chamber | |||
| annular combustion chamber; annulus | |||
| doughnut (of the betatron) | |||
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| annular chambers | |||
| Ringkammer: 1 phrase in 1 subject |
| Earth sciences | 1 |