Physicist William David Coolidge explains about a machine to Thomas Alva Edison in the United States.
United States USA Date:1923 Duration:1 min 1 sec Sound:NO SOUND
American inventor Thomas Alva Edison at General Electric company in the United States. Invention of X-ray tube by American physicist William David Coolidge. A man holds a X-ray tube. He also invented ductile tungsten. Coolidge explains about a machine to Edison and Charles Proteus Steinmetz. View of a bulb.
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