Civilization manualBook 1: From Bare Hands to Steam and Electricity765 entries · 23 phases · 100 years
The Island
Phase 21 — Microphone, speaker, magnetic tape and the telephone exchange  /  About year 72
21.20

Tape player and recorder

records, plays back at once, and wipes the tape for use again

KnowledgeYear 72Stands on 337 earlier

AWhat it needs

Needs 337 other products in all, 6 of them directly.

View

Open a box to see what it needs. A dashed box is a product already drawn in full: click it to jump there. In the org chart, drag to move around.

The step-by-step procedure for this entry has not been written yet.