Items

• [E1518IDB], Letter from Thomas Alva Edison to Powers-Weightman-Rosengarten, October 9th, 1915
  1915-10-09
• [E1518IDB1], Letter from William Henry Meadowcroft to Powers-Weightman-Rosengarten, October 21st, 1915
  1915-10-21
• [E1518KBO], Letter from William Henry Meadowcroft to Powers-Weightman-Rosengarten, November 18th, 1915
  1915-11-18
• [E1616BAQ], Letter from West Orange Laboratory to Powers-Weightman-Rosengarten, February 5th, 1916
  1916-02-05
• [X501A16], Letter from Charles Francis Hunter to Powers-Weightman-Rosengarten, November 8th, 1924
  1924-11-08