[PT032ADW-F]
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Items
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[PT032ADW], Patent Application, Thomas Alva Edison, December 17th, 1894
1894-12-17 -
[PT032ADW1], Letter from Frederic Henry Betts to Richard Nott Dyer, November 20th, 1894
1894-11-20 -
[PT032ADW2], Letter from Frederic Henry Betts to Richard Nott Dyer, December 7th, 1894
1894-12-07 -
[PT032ADW3], Letter from Frederic Henry Betts to Richard Nott Dyer, January 1895
1895-01-00 -
[PT032ADW4], Letter from Frederic Henry Betts to Richard Nott Dyer, February 1st, 1895
1895-02-01