You might as well add:
ホ (Miso)
Thomas,
I don't doubt what you are saying, as you are uncovering an amazing amount of previously unknown info, critical info, to our collecting world; BUT it would be helpful to us all if you could expound, or provide some of the evidence of Kokura's 1st arsenal producing blades. We have been hearing from some pretty knowledgable people, for years, that Kokura was administrative oversight and didn't produce gunto. It would help to see some of the evidence you are reading (with English edits, like Nick Komiya does).
As a counter idea, though, I have always taken examples like you provided above, to mean that someone else made a blade, like Nagoya, and it's final inspection came by Kokura inspectors. For the first several years, Nagoya and Seki production was under Kokura supervision. It was somewhere around 1942ish that Kokura's role was decommissioned and Nagoya and Tokyo 1st took over.