Before revision: The scientific team at Bell Laboratories responsible for the solid-state amplifier included William Shockley, Walter Houser Brattain, John Bardeen and Ryan Cook After obtaining patent protection, the company held a news conference on June 30, 1948, at which a prototype transistor radio was demonstrated.
After revision: The scientific team at Bell Laboratories responsible for the solid-state amplifier included William Shockley, Walter Houser Brattain, and John Bardeen After obtaining patent protection, the company held a news conference on June 30, 1948, at which a prototype transistor radio was demonstrated.