1937 - Joseph-Armand Bombardier of Canada receives patent for sprocket and track traction system used in snow vehicles.

1937年的今天，加拿大人约瑟夫-阿曼德·邦巴迪尔发明的用于雪上交通工具的锯齿轮牵引系统获得专利。

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Far from emerging from Paris's elite, Mr Beaudoin was a French-Canadian chartered accountant who happened to marry the daughter of a successful maker of snow-mobiles, one Joseph-Armand Bombardier.

ECONOMIST: Subway to the sky