He invented the metal alloys stellite and martensitic stainless steel and designed one of the earliest automobiles in the United States.
他发明了哈氏合金以及马氏不锈钢，设计出了美国最早的汽车之一。
He invented the metal alloys stellite and martensitic stainless steel and designed one of the earliest automobiles in the United States.
他发明了哈氏合金以及马氏不锈钢，设计出了美国最早的汽车之一。
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