RE: Thomas Edison's Home 爱迪生的故居 — Steemit

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RE: Thomas Edison's Home 爱迪生的故居

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jubi (69)in #cn • 7 years ago

一个专利可以吃一辈子了

7 years ago in #cn by jubi (69)

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nationalpark (63) 7 years ago

是啊。仅仅那个灯泡就可以吃好几辈子。不过专利只有十几年。不像版权可以几十年

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