FEBRUARY 4 1905. HOPKINS 'BAND ELECTRO-CHRONOGRAPH' CARABLE OF DIVIDING A SECOND OF TIME INTO ONE HUNDRED THOUSAND AND ONE MILLION PARTS. Scientific American, 1905-02-04
FEBRUARY 4 1905. HOPKINS 'BAND ELECTRO-CHRONOGRAPH' CARABLE OF DIVIDING A SECOND OF TIME INTO ONE HUNDRED THOUSAND AND ONE MILLION PARTS. Scientific American, 1905-02-04
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