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Scientific American, Vol. 36, No. 15 (1877) (1877)

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An illustration from Scientific American, Vol. 36, No. 15 (1877), 1877, leaf 0
. 2 eaee per Anvnum. NEW YORK, APRIL i4, Vol. XXXVI.—No. #2?) [POSTAGE PREPAID.] [NEW 8ERIES.] … IMPROVED RAILROAD GRADER. in which works a large roller. In rear of the latter is a plat- The accompanying engravings represent a novel device for form which is weighted heavily or lightly, as desired. This expeditiously grading railroads. Itis mainly intended for is all there is of the machine…

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