Conversation so far:
When did the inventor Lee de Forest work on Arc radiotelephone development ?
On July 18, 1907, de Forest made the first ship-to-shore transmissions by radiotelephone.
How did the inventor Lee de Forest do Arc radiotelephone development?
Using his sparkless arc transmitter, de Forest first transmitted audio across a lab room.
What did Lee de Forest transmit in his 1906 experiment ?
de Forest first transmitted audio across a lab room on December 31, 1906, and by February was making experimental transmissions, including music produced by Thaddeus Cahill's telharmonium.
is there anything else interesting about the  Lee de Forest article?
The company set up a network of radiotelephone stations along the Atlantic coast and the Great Lakes, for coastal ship navigation.
Did setting up stations along the coast work for Lee de Forest's arc radiotelephone experiments?
The installations proved unprofitable.

Question: did they use the technology for anything else?
Self-contained rewrite: did the US Navy use Lee de Forest's technology for anything else?