{HEAD ~ A planetary gear reduction system} 5, wherein {TAIL ~ said casing} includes a first member and a second member abutting opposing ones of said axial ends of said internal gear 
{ HEAD ~ A planetary gear reduction system } 5 , wherein { TAIL ~ said casing } includes a first member and a second member abutting opposing ones of said axial ends of said internal gear
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH