Across
- 2. Iron & steel tools
- 4. Printing Press, Magnetic Compass, Waterwheel, Paper Money.
- 6. Telescope
Down
- 1. Simple stone tools
- 2. Revolution Flour Mill, Power Loom, Interchangeable Parts, Movable conveyor
- 3. Cell phones
- 5. Large scale irrigation, writing, navigation, tools made of copper.
- 7. automation