Very nice article, Aaron.
I am also one of the lucky people who managed to acquire one of these. I also have the technical maintenance manual, and it's possible that pages from this could accidently fall face-down onto my scanner
The RN divers loved it. Very robust, compact and good to dive in the water. The only downsides were (and are) its limited scrubber duration and the HP bypass valve which can get knocked sending HP gas directly into the counterlung. Considering how old it is, it's an amazingly versatile design.
Andy