Items

• [D7805ZFM], Publication, Hall & Co, 1878
  1878-00-00
• [D7809Q], Letter from Hall & Co to Thomas Alva Edison, September 30th, 1878
  1878-09-30
• [D7809R], Letter from Hall & Co to Thomas Alva Edison, October 7th, 1878
  1878-10-07
• [D7809ZAE], Letter from Hall & Co to Thomas Alva Edison, December 2nd, 1878
  1878-12-02