Abstract of His Majesty's royal letters patent. George R. ... Whereas, R. Darby and Co. have, with much labour and study, invented a portable instrument for detecting frauds by counterfeit gold, ..

  • R. Darby
Date:
[1753]
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  • Online

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Abstract of His Majesty's royal letters patent. George R. ... Whereas, R. Darby and Co. have, with much labour and study, invented a portable instrument for detecting frauds by counterfeit gold, .. (Online)

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[1753]

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  • Full text available: 1753.
Available in Eighteenth Century Collections Online.

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