Items

• [E1616ACU], Letter from Pittsburgh Plate Glass Co, Halbert Kellogg Hitchcock to Thomas Alva Edison, January 31st, 1916
  1916-01-31
• [E1910AX], Letter from Pittsburgh Plate Glass Co, Halbert Kellogg Hitchcock to Thomas Alva Edison, May 10th, 1919
  1919-05-10
• [E1930BJ], Letter from Pittsburgh Plate Glass Co, Halbert Kellogg Hitchcock to William Henry Meadowcroft, November 14th, 1919
  1919-11-14
• [E1930BK], Letter from Halbert Kellogg Hitchcock, Pittsburgh Plate Glass Co to Harry Bertram Higgins, November 14th, 1919
  1919-11-14
• [E1930BM], Letter from Pittsburgh Plate Glass Co, Harry Bertram Higgins to Thomas Alva Edison, November 17th, 1919
  1919-11-17
• [E1930BN], Telegram from Pittsburgh Plate Glass Co to Edison (Thomas A.) Inc, November 25th, 1919
  1919-11-25
• [E1948AA], Letter from Pittsburgh Plate Glass Co, Halbert Kellogg Hitchcock to Thomas Alva Edison, January 3rd, 1919
  1919-01-03
• [MF14AN], Letter from Pittsburgh Plate Glass Co, Halbert Kellogg Hitchcock to Thomas Alva Edison, April 7th, 1917
  1917-04-07