Across
- 3. made the first flying machine
- 5. To get rid of
- 7. did not rely on other businesses for steel; he got involved in every aspect
- 8. to make different
Down
- 1. invention factory at Menlo Park NJ light bulb and hundreds more inventions
- 2. a document giving someone the sole right to make and sell an invention/product
- 4. made one of the first telephones
- 6. free from impurities