A developer roller which is semiconductive comprising a rubber body containing soyadimethylethyl ammonium ethosulfate in an amount of {TAIL ~ between 0.5 phr} to {HEAD ~ 4.0 phr} by weight of said rubber, blended therein to increase conductivity of said body 
A developer roller which is semiconductive comprising a rubber body containing soyadimethylethyl ammonium ethosulfate in an amount of { TAIL ~ between 0.5 phr } to { HEAD ~ 4.0 phr } by weight of said rubber , blended therein to increase conductivity of said body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH