Items

• [MBP008], Patent Specification, Thomas Alva Edison, July 19th, 1877
  1877-07-19
• [PT005A1], Patent Specification, Thomas Alva Edison, April 9th, 1873
  1873-04-09
• [PT005B1], Patent Specification, Thomas Alva Edison, April 9th, 1873
  1873-04-09
• [PT005C1], Patent Specification, Thomas Alva Edison, April 22nd, 1873
  1873-04-22
• [PT005D1], Patent Specification, Thomas Alva Edison, April 16th, 1873
  1873-04-16
• [PT005E1], Patent Specification, Thomas Alva Edison, April 16th, 1873
  1873-04-16
• [PT005F1], Patent Specification, Thomas Alva Edison, April 16th, 1873
  1873-04-16
• [PT005G1], Patent Specification, Thomas Alva Edison, April 16th, 1873
  1873-04-16