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| 1916 |
| | The Federal-Aid Highway Act sets up the first national road system in the US | |
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| 1916 |
| | Captain Peter Nissen, a Canadian mining engineer, designs the Nissen Hut for the Allied armies | |
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| 1916 September 15 |
| | Eleven British tanks go into pioneering but ineffective action at the battle of the Somme | |
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| 1917 November 20 |
| | Suitable ground is selected by the British at the battle of Cambrai for the first serious deployment of their new tanks | |
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| 1919 |
| | John Alcock and Arthur Whitten Brown fly from St John's in Newfoundland to Clifden in Ireland | |
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| 1919 |
| | Canadian National Railways is formed from two of the country's largest rail systems | |
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| 1921 |
| | The British airship R-38 bursts into flames on its fourth flight and crashes into the Humber | |
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| 1922 |
| | British manufacturer Herbert Austin launches Britain's first car for the popular market, the Austin Seven or 'Baby Austin' | |
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| 1922 |
| | Linus Pauling, a graduate student at the California Institute of Technology, begins theoretical work on the nature of the chemical bond | |
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| 1924 |
| | German scientist Felix Wankel builds a model of a rotary engine, thirty years before the first prototype is manufactured | |
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