A gaming apparatus which comprises a slat machine capable of accepting either paper currency, preprinted coupons, or cash out slips. A friction coefficient between the conductive member and the inner surface of the charging tube may be less than a friction coefficient between the photoconductive medium and the outer surface of the charging tube, so that a slip phenomenon of the charging tube is prevented. A first lens unit being overall negative and including a reflecting surface that bends a luminous flux substantially 90 degrees; and a second lens unit disposed with a variable air distance from the first lens unit, and having a negative optical power. The slice definition and the RTL shell provides the correct logic for a set of logic interfaces for the design specification to connect. As another option, the tag may contain an ionic material and the removing may include applying an electric field. A fluid treatment device comprise the cleaning apparatus is also described.