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ayrton patent

Cover page of US Patent 310,450 ‘Draftsman’s Dividing Instrument’, filed on 3 May 1884 and granted on 6 January 1885

Cover page of US Patent 310,450 ‘Draftsman’s Dividing Instrument’, filed on 3 May 1884 and granted on 6 January 1885

Posted on June 24, 2022June 24, 2022 Full size 558 × 908

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Published inHertha Ayrton, Pioneering Woman, Electrical Engineer and Feminist

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