An illustrated description of a spoke wheel for railway cars in which the hub and spokes are forged from a single block of steel. (900 w.)
The ehrhardt seamless car wheel
Nahtloses Speichenrad, Patent Ehrhardt
1903
Aufsatz (Zeitschrift)
Deutsch
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Kapitän Ehrhardt : Abenteuer und Schicksale
GWLB - Gottfried Wilhelm Leibniz Bibliothek | 1924
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