Civilization manualBook 1: From Bare Hands to Steam and Electricity765 entries · 23 phases · 100 years
The Island
Phase 12 — Precision and machine tools  /  About year 31
12.11

Cylinder boring mill

a rigid bar bores a true round cylinder; the key to steam

MakingYear 31Stands on 151 earlier

AWhat it needs

Needs 151 other products in all, 4 of them directly.

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