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the first x-ray machine
when was the first x ray machine invented
when was the first x ray machine made
first portable x ray machine
when was the first x-ray machine invented
who made the first x ray machine
first ever x ray machine
what did the first x-ray machine look like
who invented the first x-ray machine
the first x-ray machine, when was the first x ray machine invented, when was the first x ray machine made, first portable x ray machine, when was the first x-ray machine invented, who made the first x ray machine, first ever x ray machine, what did the first x-ray machine look like, who invented the first x-ray machine
