Four kymograph or more probably polygraph/sphygmograph records

Four kymograph or more probably polygraph/sphygmograph records

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Four kymograph or more probably polygraph/sphygmograph records
Science Museum Group
© The Board of Trustees of the Science Museum

Four kymograph or more probably polygraph/sphygmograph records, in brass-mounted leather case, British, 1890-1910.

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