Items

• [CK902AAC], Minutes, Motion Picture Patents Co, January 26th, 1909
  1909-01-26
• [D0406AAA], Letter from William Joseph Hammer to Thomas Alva Edison, January 2nd, 1904
  1904-01-02
• [LB070155], Letter from Thomas Alva Edison to William Joseph Hammer, December 31st, 1903
  1903-12-31
• [NB260025] Technical Note, April 1913
  1913-04-00
• [NB260027A], Technical Note, Zachariah Power Halpin, April 17th, 1913
  1913-04-17
• [X098B008], Letter from William Joseph Hammer to Thomas Alva Edison, December 29th, 1903
  1903-12-29
• [X098B010], Letter from William Joseph Hammer to Thomas Alva Edison, January 2nd, 1904
  1904-01-02