William D Coolidge
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William David Coolidge (1873-1975), inventor of the Coolidge x-ray tube.
Photograph taken in 1900 at the age of 27 years old.
- Author: Bain News Service, publisher
- Original file: https://upload.wikimedia.org/wikipedia/commons/c/c8/Dr._W.D._Coolidge_LCCN2014714233.jpg
- Modifications: minor cropping only
- License: No known copyright restrictions. Public domain.