LIBROS DEL AUTOR: william lloyd derr

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  • Block Signal Operation
    William Lloyd Derr
    Block Signal Operation: A Practical Manual is a book written by William Lloyd Derr and published in 1897. The book provides a comprehensive guide to the operation of block signals, which are used to control train traffic on railroads. It covers the principles of block signaling, the different types of signals and their functions, and the methods used to operate them. The book a...
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    38,93 €