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I Forge Iron

What TYPE of power hammer is this

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"semi elliptical multi leaf steel spring linkage"  is what is mentioned in "Pounding out the Profits"  WRT Thomas Shaw's patent of 1866. Dupont's coil spring linkage was patented in 1890...   (Lots of interesting info in that book on the "development and manufacture of crank actuated open-die power forging hammers"!

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