Frederick Leland Rhodes, The Beginnings of Telephony, Harper & Brothers Publishers, NY, 1929, p.104.
NEWERBell at the opening of the long-distance line from New York to Chicago in 1892.
OLDERThe Inventor of the Switchboard – Tivadar Puskás
Your email address will not be published. Required fields are marked *
Save my name, email, and website in this browser for the next time I comment.