supply of 1 no of digital multifunctional mono copier machine under buy back scheme for the use in office of taxation and appeal committee 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 25cpm 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 of reputed make , buy back offer for existing photo copier machine , 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