N16UF ownership History

I'm trying to piece together the ownership history of N16UF. It's a
Speed Astir II, SN 4005.
It appears that the first owner (5/79) was based in Michigan, but I
can't make out the name in the log book. There are two sets of
initials in the book for that period, I can't even guess at the first,
but the second is LMR.
From 4/80 to 8/81 it was flown by R.L. Garvin, mostly at El Mirage and
Perris.
From 5/82 to 9/85 it seems to have been jointly owned by Don Slotten,
and M.J. Don (can't be sure)
From 1/86 to 6/92 ????
6/92 to 11/03 Ralph Biesemeyer
11/03 me.
This is obviously not a top priority, but if anyone happens to be able
to fill in any of the gaps, I'd appreciated it.

Thanks,
Jim