'In the '40s AT&T used a radio with no conventional vacuum tubes to demonstrate this device invented in its lab'
a transistor
NOW THAT'S INVENTIVE!: In the '40s AT&T used a radio with no conventional vacuum tubes to demonstrate this device invented in its lab
In the '40s AT&T used a radio with no conventional vacuum tubes to demonstrate this device invented in its lab
In the '40s AT&T used a radio with no conventional vacuum tubes to demonstrate this device invented in its lab
NOW THAT'S INVENTIVE!
a transistor
NOW THAT'S INVENTIVE!