Related Clues:
- It began about 1000 B.C.
- Advanced toolmaking period
- Early period
- Early period of civilization
- Early toolmaking period
- Early tool-making time
- When bronze was replaced, historically
- It began about 3500 BC
- It started around 1100 B.C.
- It began in Europe around 1200 B.C.
- Historic toolmaking period
- Sumer's era
- When forging started
- When metal-casting started
- Period in human history