"Noir et Blanc" gas x-ray tube with vacuum regulat

Noir et Blanc' gas x-ray tube with vacuum regulator, supplied by the Medical Supply Association Ltd., London,

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Noir et Blanc' gas x-ray tube with vacuum regulator, supplied by the Medical Supply Association Ltd., London,
Science Museum Group
© The Board of Trustees of the Science Museum

"Noir et Blanc" gas x-ray tube with vacuum regulator, supplied by the Medical Supply Association Ltd., London, 1910-1935.