In 2012 I shared this video on my youtube channel showing the device I made to work on SRT.
This is the proof that I was the first one to make 3 points to adjust the friction and one internal cam.
Obviously this is not the final device, 'cause this first prototype has been engineered.

Just a few advantages: first of all, it has an internal cam and doesn't need a stiff tether, so it's very compact. It can be adjusted according to the weight of the climber or his preference just pushing a "button". It can be used for rescue or for long descendings. It can also be used in drt without take it away from the rope.

The final version is going to be produced by FTC which I thank for believing in me.
Video: [ Ссылка ]
[ Ссылка ]

Another videos:
Rescue FF device and frictioned branch (july 2014): [ Ссылка ]

Control blocks (rigging), with Friction Fiori. (july 2015): [ Ссылка ]

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