Abstract: A certificate requesting method, a certificate issuing method, a certificate system and a computer-readable medium thereof are provided, in which subscriber identity identification information, a private key and a public key certificate bound to a first security chip are converted into a private key bound to a second security chip via an online identity authentication procedure, and the corresponding public key certificate is issued by a certificate authority server, so as to improve the usability, the convenience and the security thereof.

Abstract: A power tool including a pistol grip handle containing a chamber connected to external opening to permit easy installation of batteries; a drive head provided at its end a rotation chuck to adapted to a bit of a hand tool, and multiple projection lights to project light to the bit; a control switch to control the on and off of the projection lights, a cover pivoted to the handle to cover up the opening; the cover swings on one side of the opening of the pistol grip handle; and multiple channels provided on the inner side of the cover for storage of bits.

Abstract: A detachable spare-parts container mountable with a tool container, comprising a body having a plurality of drawers to contain spare-parts and being slidable, the body being insertable to the tool container, characterized in that a plurality of holes are provided to the top section of the body and an urging block is protruded from the external end at the top section of the hole, and the drawer is at a box body slidably engaged at the hole, thereby various types and a larger number of spare-parts can be stored within the container.