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| mercury vapour; mercury-vapour | |||
| vapeur de mercure: 40 phrases in 11 subjects |
| Antennas and waveguides | 1 |
| Chemistry | 5 |
| Earth sciences | 1 |
| Electric traction | 1 |
| Electronics | 19 |
| Mechanic engineering | 2 |
| Medical appliances | 1 |
| Microscopy | 1 |
| Technology | 5 |
| Transport | 3 |
| Vacuum tubes | 1 |