"On This Date in Cryptologic History" Calendar
1881: First telephone ciphony device invented by James Harris Rodgers.
20 Dec 1881: First telephone ciphony device invented by James Harris Rodgers, chief electrician of the U.S. Capitol.
"On This Date in Cryptologic History" Calendar
20 Dec 1881: First telephone ciphony device invented by James Harris Rodgers, chief electrician of the U.S. Capitol.