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References
- ↑ "Grand Opera by Wireless", Telephony, March 5, 1910, pages 293-294.
- ↑ "Met Performance" (CID:46150)
- ↑ Slotten, Hugh Richard (2000). Radio and Television Regulation: Broadcast Technology in the United States 1920–1960 . JHU Press. pp. 6–8. ISBN 0-8018-6450-X.