In 1857 America entered the toothbrush market when H. N. Wadsworth was awarded the first patent in America for their production.
1857年牙刷进入美国市场，H.N.沃兹沃斯第一个获得特许在美国生产牙刷。
In 1857 America entered the toothbrush market when H. N. Wadsworth was awarded the first patent in America for their production.
1857年牙刷进入美国市场，H.N.沃兹沃斯第一个获得特许在美国生产牙刷。
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