Απουσία εξορία κρατήρας k d k a ακροατές ραδιοφώνου με ακουστικά το 1920 ρυθμίζω Εμπλουτίζω Γενναιοδωρία
Ραδιόφωνο - Βικιπαίδεια
Radio Broadcasting Becomes a Reality: KDKA on Nov. 2, 1920 – Radio Heritage Foundation
KDKA Centennial
KDKA: Broadcasting's Pioneer Station | Pennsylvania Center for the Book
Radio Broadcasting Becomes a Reality: KDKA on Nov. 2, 1920 – Radio Heritage Foundation
Radio Broadcasting Becomes a Reality: KDKA on Nov. 2, 1920 – Radio Heritage Foundation
KDKA's 1920 Broadcast Centennial - Issuu
KDKA's 1920 Broadcast Centennial - Issuu
The Centennial of KDKA's Historic 1920 Broadcasts
KDKA Turns 100: A Century of Radio in Pittsburgh | One hundred years ago, on Nov. 2, 1920, KDKA broadcast from Pittsburgh as the world's first commercially licensed radio station, igniting an