Civilization manualBook 1: From Bare Hands to Steam and Electricity765 entries · 23 phases · 100 years
The Island
Phase 10 — Blast furnace, coal, cast iron and rolling  /  About year 26
10.28

Tungsten tool steel

cutting tools that keep their edge when they run hot

MakingYear 26Stands on 128 earlier

AWhat it needs

Needs 128 other products in all, 3 of them directly.

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