"28ASR Installation of Component Units" - I have

Issue 1 dated April 1967 (Teletype 573-101-200TC - copyright 1958)

Issue 2 dated April 1964 (AT&T BSP 573-101-200 - copyright 1964)

I've seen a month difference between corresponding BSP and TC but what's up with this?

TC issue 1 is 19 pages and includes aux reperf installation

BSP issue is 10 pages and no aux reperf info.

Have I just been unaware that BSP and TC editions are really two separate animals?

Or ???

Mystified in NC,