Lee De Forest's schematic diagrams and scientific notes on hotel stationery, ca. 1915.
(Lee De Forest Papers) 010 0001.gif 1 1 /ò*P 0001.jpg Êø Lee De Forest's schematic diagrams and scientific notes on hotel stationery, ca. 1915.
(Lee De Forest Papers) 010 0002.gif 2 2 /ò*P 0002.jpg Êø