[PT032AIY-F]
https://edisondigital.rutgers.edu/folder/PT032AIY-F
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[PT032AIY], Patent Application, Thomas Alva Edison, December 9th, 1908
1908-12-09 -
[PT032AIY1], Technical Note, Thomas Alva Edison, November 23rd, 1908
1908-11-23 -
[PT032AIY2], Letter from Henry Lanahan to Frank Lewis Dyer, January 18th, 1911
1911-01-18 -
[PT032AIY3], Letter from Frank Lewis Dyer to Henry Lanahan, January 19th, 1911
1911-01-19