[PT032ACG-F]
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Items
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[PT032ACG], Patent Application, Thomas Alva Edison, July 23rd, 1890
1890-07-23 -
[PT032ACG1], Technical Note, Thomas Alva Edison, July 23rd, 1890
1890-07-23 -
[PT032ACG2], Letter from Thomas Alva Edison to Richard Nott Dyer, July 22nd, 1890
1890-07-22 -
[PT032ACG3], Letter from Alfred Ord Tate to Dyer and Seely, September 14th, 1892
1892-09-14