[GreenKeys] BSP and TC dates and issues?

[Nick England]

"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,
Nick England K4NYW
www.navy-radio.com
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