Types in History.

All:

Does anyone happen to know what the types returned by the history command
correspond to?  The command line client ToString()s them but does not
provide any interpretation beyond that.

The types I've had returned are 10, 60, 70, and 80.  I'm fairly certain 70
is some sort of creation event and 60 looks to be item checked in (not
necessarily updated though - depends on client settings).  But 10, 70, and
80 seem to bear quite a few similar characteristics.

I thought someone at SourceGear might have an easy, fast answer for me. :)

TIA.

Brian