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| before 1948, transistors were unknown; prior to 1943, heavy water was produced by electrolysis of water | |||
| до ... года: 248 Phrasen in 43 Thematiken |
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| before 1948, transistors were unknown; prior to 1943, heavy water was produced by electrolysis of water | |||
| до ... года: 248 Phrasen in 43 Thematiken |