 |
| |||
| prior to (prior to 1943, heavy water was produced by electrolysis of water) | |||
| before 1948, transistors were unknown | |||
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до ... года : 258 Phrasen in 46 Thematiken |
|
| |||
| prior to (prior to 1943, heavy water was produced by electrolysis of water) | |||
| before 1948, transistors were unknown | |||
|
до ... года : 258 Phrasen in 46 Thematiken |