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| English | German |
| double focus X-ray tube | Doppelfokus-Röntgenröhre |
| double focus X-ray tube | Doppelfokusröhre |
| double glass wall tube | Doppelglasröhre (X-ray tube) |
| double glass wall tube | Doglas-Röntgenröhre (X-ray tube) |
| double glass wall tube | Doglasröhre (X-ray tube) |