What was Edison’s first practical invention

1 Australia

2 Brunei

3 Canada

4 Chile

5 China

6 Hong Kong*

7 Indonesia

8 Japan

9 South Korea

10 Malaysia

11 Mexico

12 New Zealand

13 Papua New Guinea

14 Peru

15 Philippines

16 Russia

17 Singapore

18 Taiwan

19 Thailand

20 United States of America

21 Vietnam

* Not a country, part of China.