Working 15 or more switch engines. (Also discussion.) (6000 w.) (68276 A)
Yard operation
C R C, Pro
1916
Aufsatz (Zeitschrift)
Englisch
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Engineering Index Backfile | 1925
|Engineering Index Backfile | 1927
|Co-operation in yard operation
Engineering Index Backfile | 1915
|Engineering Index Backfile | 1928
|Engineering Index Backfile | 1928
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