When was the motorcycle helmet invented?

Related questions

1. Are carbon fiber helmets better?
2. Is ECE better than Snell?
3. What is Bell MIPS?
4. How tight should a helmet fit?
5. Where are Bell helmets made?
6. What is the best material for motorcycle helmets?
7. Are Shoei helmets DOT approved?
8. Where is HJC helmets made?
9. What is ECE 22.05 certified?
10. What does HJC stand for?

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2. #market
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4. #motorcycle
5. #street
6. #1960s
7. #which
8. #standards
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15. #helmets
16. #racers
17. #safety
18. #legal
19. #adhere