Civilization manualBook 1: From Bare Hands to Steam and Electricity765 entries · 23 phases · 100 years
The Island
Phase 06 — Iron and steel  /  About year 3
06.01

Double board bellows with flap valves

a steady, strong air blast

MakingYear 3Stands on 51 earlier

AWhat it needs

Needs 51 other products in all, 3 of them directly.

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