How does Lion Steel TOL lock work?

From what information i managed to suck out of that text, it seems like it's a locking slipjoint?

Also, thanks for showing me that knife, i like it. I think i'll buy one.
 
I have it and like it very much. Indeed, it's not an axis lock, but in some way it locks the backspring. I couldn't see exactly how it does that (didn't disassemble it).
 
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