What kind of information? Not sure there are many here that know what they are, fewer that have seen one, and even fewer that have installed and operated one. It has been over 20 years for me.
The one I installed worked but the "automatic" fingers were very fragile. If I remember correctly the vineyard owner of the unit I installed, ended up extending and retracting the arm manually (meaning she hit the lever) rather than relying on the "feelers".