four-element
| valve
| four-element abbr. | |
| opt. | vierlinsig |
| valve abbr. | |
| gen. | Elektronenröhre; Radioröhre; Ventil; Klappe; Armatur |
| refrig. | Arbeitsventil |
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| vierlinsig (design) | |||
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four-element : 6 phrases in 3 subjects |
| Computers | 1 |
| Physics | 4 |
| Technology | 1 |