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Scientific American, Vol. 89, No. 7 (1903) (1903)
leaf 3
the They may, however, be made to turn in the same di- The number of employes of the railways of the sockets, pen-heads are mounted to turn freely. The rection by reversing wheels, one of which is always United States at the close of last year was 1,189,315, heads are pierced with square holes,… … © 1903 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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