[Robert A Cook PE]

To summarize:

No. It is "almost" possible, using a single, very expensive, very-difficult-to-use, very uncommon typewriter of the period.

But it is not reasonable to assume an Air Force fighter-pilot Lt Col is going to sit down and perfectly type such a "memo" to himself and use the colloquialism and superscripts that are evident on the letters.

It is impossible to assume that these are real, unless CBS can produce the originals in the original paper with the real fingerprints of the colonel on the paper.

[js1138]

Your summary is baloney. The only thing at issue here is whether Killian had an IBM Executive typewriter with a TimesNew Roman type ball. (And whether these memos were typed on it.)

The discussion of typewriter technology is pretty much settled. What isn't settled is whether these letters (provided by someone named Killian, and known Bush hater) are completely authentic. Since they are not the originals, they could have been modified and re-copied.