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Scientific American, Vol. 27, No. 23 (December 1872) (1872)

leaf 7

An illustration from Scientific American, Vol. 27, No. 23 (December 1872), 1872, leaf 7
HARDENING THE DIES HARDENING THE PLATES. © 1872 SCIENTIFIC AMERICAN, INC December 7, 1872.] Mmtiik %mmtm. 359 is one easily counterfeited. The national cur-rency, that is, the bills which are issued bythe national banks and not by the UnitedStates Government, are not printed on thispaper. The next…

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