Before revision: Right after the war, AT&T used 4-watt klystrons in its brand new network of microwave relay links that covered the US continent .Gerald W. Brock, The Second Information Revolution, Harvard University Press, 2009, , pp.
After revision: Right after the war, AT&T used 4-watt klystrons in its brand new network of microwave relay links that covered the contiguous United States .Gerald W. Brock, The Second Information Revolution, Harvard University Press, 2009, , pp.