Die Technik im Zwanzigsten Jahrhundert, Vol. 2: Die Verarbeitung der Rohstoffe (Classic Reprint) - Softcover

Excerpt from Die Technik im Zwanzigsten Jahrhundert, Vol. 2: Die Verarbeitung der Rohstoffe

Wenn aud'1 im gegenwärtigen Jahrhundert noch mehr die Wasserkrafte, ja der Wind und die strahlende Energie der Sonne zur Gewinnung motorischer Kraft heran gezogen werden, so dürfte die Kohle trot3dem ihre dominierende Stellung in dem selben langere Zeit behaupten.

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