<p>I believe it was a joint degree. Back in the old days, MIT and Harvard used to offer lots of joint degree programs. They still do, especially in the Health Sciences and Technology program which is run jointly. </p>
<p>However, I'll say this. According to the MIT alumni database, Vannevar Bush received an EGD degree (a Doctor of Engineering degree) in EECS (course 6) from MIT in 1916. But he does not show up in the Harvard alumni database at all. So is he really a Harvard alumni? I guess it depends on how you define the word "alumni"?</p>