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when was x ray machine invented
who invented the x ray machine
when was the first x ray machine invented
x ray machine invented
where was the x ray machine invented
what year was the x ray machine invented
who invented the portable x ray machine
when was x ray machine invented, who invented the x ray machine, when was the first x ray machine invented, x ray machine invented, where was the x ray machine invented, what year was the x ray machine invented, who invented the portable x ray machine
