[Ford-ferguson] Sherman 9N Live PTO

[Jim Peck @Yahoo]

This link mentions that Sherman at one time offered a Live PTO option,
presumably for the 9N. 
http://home.att.net/~jmsmith45/sherman.htm

Does anyone have any additional information to add? We know that the 1946
Cockshutt 30 was the first production tractor to offer Live PTO. It would be
interesting to me to know when aftermarket Live PTO was available on the 9N.
Incidentally, I have been using the term Independent PTO to refer to a system
that allows starting and stopping the PTO independently of the clutch or
transmission status.