supply of 1 no . digital copier machine under buy back scheme for use in office of vigilance dept , ripon building premises , supply of digital multifunctional copier machines with duplex copying and printing , scanner and network duly trolley mounted with minimum copying speed of 45cpm and paper size of upto a3 ( original and image ) and with 1024 mb ram with 160gb to 500gb hard disk along with trolley and 2 kva voltage stabilizer , buy back offer for existing photo copier machine working in vigilance department ( less ) , rate of comprehensive maintenance of copier machine after guarantee period on per copy basis- ( after guarantee period the successful bidder should carryout comprehensive maintenance of the machine at the agreed per copy basis rate for three years ) . per copy-black , rate of replacement toner-black , rate of replacement developer-black , rate of replacement drum-black