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Scientific American, Vol. 52, No. 18 (1885) (1885)
leaf 7
les of tubes ground, prior to the final erection. are required in the completed bridge, The roads are so arranged as to be iii it at once becomes evident that the all equally suitable of access for construction of them could only be the steam traveling cranes used in effected within a reasonable… … Fig. 2.—SECTION OF TUBE DRILLING MACHINE, © 1885 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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