Prensa de forja e stone tool: o que têm em comum

1. Passo 1. Prensa de forja — evoluiu de — Steam hammer. Pressing instead of striking.
2. Passo 2. Steam hammer — evoluiu de — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
3. Passo 3. Hammer — evoluiu de — Stone tool. The first hammer was a stone in the hand.

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