what is the list of strikes?
1955, southern bell telephone co., 1968, at&t, 1971, bell system, 1983, bell system, 1986, at&t, 1989, at&t, 1989, nynex, 1998, us west, 2000, verizon, 2011, verizon, 2012, at&t
which strikes are from at&t?
1968, at&t, 18 days, 1986, at&t, 25 days, 1989, at&t, n/a, 2012, at&t, 2 days
form the strike in 2012, how long was it?
2 days