Geo H Helvey and J W See Developed Planieter An Instrument Designed for the Measurement of Areas of Irregular Objects

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Clipped from
  1. The Journal News,
  2. 17 Dec 1930, Wed,
  3. Page 3

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  • — Geo H Helvey and J W See Developed Planieter An Instrument Designed for the Measurement of Areas of Irregular Objects

    Clipped by cruther64 – 03 Jul 2013