Ready reckoner for interest calculations patented 1906

Made:: 1915-1925 in United States

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Ready reckoner for interest calculations patented 1906
Science Museum Group
© The Board of Trustees of the Science Museum

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Category:: Mathematics

Object Number:: 1990-693

type:: ready reckoner (financial)

credit:: Auction Team Koln

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Ready reckoner for interest calculations patented 1906

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