Campbell X-ray and high-frequency apparatus is the standard of the world : it has no peer.

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Campbell X-ray and high-frequency apparatus is the standard of the world : it has no peer. Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.