MAGNATRON Rock Lock. "The re-invention of the auto-locking karabiner". Two
independant magnets lock the karabiner nose. 24 7 7 kN. Gate opening = 22mm. NB Only 8 left at this price. $35.00
I've got a copy of the Taylor/Penney guide and should be able to scan it OK, but the font is tiny and it's going to be a bit hard to fold back to get a clean scan since it's in the middle. I'm on the upper North Shore if you want to borrow the guide for a bit - it hasn't actually been used in longer than I care to think.