high-grade steel, museum, steel mill, smelting works, valve, connecting piece,

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Keywords: annexation, connecting, connection, connectivity, edelstahlgewinnung, edelstahlproduktion, furnace, hattingen, henrichshtte, high-grade, industriekultur, interface, mill, museum, piece, ruhrstahl, smelting, stahlgewinnung, stahlrohre, steel, valve, works