Patent ID: 7240845

Claim:
An information-holding unit comprising: a plurality of information carriers with specific different information stored in each, at least one of the information carriers storing information about the information-holding unit for a machine to use and another one of the information carriers storing information about reference information of the information-holding unit for a human to use, colors of the information carriers being different from one another; and a mounting body, said mounting body having a rotation axis and rotating thereabout at speeds sufficient to effect cutting operations, the mounting body being symmetrical about said rotation axis to avoid imbalance when rotating, the information carriers being mounted on said mounting body, wherein each of the information carriers is an RFID tag, the information carriers rotate about the rotation axis of said mounting body, the information carriers are mounted symmetrically with respect to the rotation axis, and the information carriers are mounted on the mounting body at balanced positions to minimize rotation imbalance in the unit, and wherein the mounting body is any one of a work mounting jig, a cutter, a cutter cartridge, or a tool holder.