Items
Creator is exactly
De Forest Radio Telephone and Telegraph Co
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[E1770BP], Letter from Lee De Forest, De Forest Radio Telephone and Telegraph Co to West Orange Laboratory, February 12th, 1917 1917-02-12 -
[E1775AJ], Letter from Lee De Forest, De Forest Radio Telephone and Telegraph Co to John Pierrepont Constable, December 26th, 1917 1917-12-26
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[MF08BN], Letter from Lee De Forest, De Forest Radio Telephone and Telegraph Co to Thomas Alva Edison, December 28th, 1916 1916-12-28