Dan G wrote:
People might be interested in the British Summit Oxygen systems,
originally designed for HA climbing - http://www.summitoxygen.com/index.php
. It uses a cannula instead of a face mask and an electronic pulse-
dose meter system, which can supply up to 22 hours of oxygen from one
bottle.

This is not a LOX system, the concept is appears to be much the same as
that used in EDS systems...

Marc