English | German | |
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Patent | ||
Patent | of steam boilers | bei Dampferzeugern |
English | German | |
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Patent | ||
Patent | in steam boilers of forced-flow type | in Zwanglaufdampferzeugern |
Patent | in flues of steam boilers | in den Zügen von Dampferzeugern |
Patent | steam boilers of forced-flow type | Zwanglaufdampferzeuger |