Abstract: The present invention relates to a disc package having a structure in which a cover can be fixed on a base by simply pressurizing the cover with respect to the base in a base shaft axial direction and, at the same time, the cover can be prevented from being accidentally separated from the base while the disc package is being transported. Further, in the disc package, a cover once fixed on a base can be separated therefrom by rotating the cover along the circumference of the base in any direction, i.e., in either a clockwise or a counterclockwise direction. Furthermore, an end portion of a shaft can be fitted into a concave portion of a cover even in case the end portion of the shaft is not aligned with the concave portion of the cover.

Abstract: The present invention relates to a disc package having a structure in which a cover can be fixed on a base by simply pressurizing the cover with respect to the base in a base shaft axial direction and, at the same time, the cover can be prevented from being accidentally separated from the base while the disc package is being transported. Further, in the disc package, a cover once fixed on a base can be separated therefrom by rotating the cover along the circumference of the base in any direction, i.e., in either a clockwise or a counterclockwise direction. Furthermore, an end portion of a shaft can be fitted into a concave portion of a cover even in case the end portion of the shaft is not aligned with the concave portion of the cover.

Abstract: The present invention provides an aqueous agent for treating metal surfaces capable of degreasing and forming a zinc phosphate coat simultaneously. The present metal surface treating agent includes an aqueous solution that includes water and a water-soluble organic solvent where the amount of water is larger than the amount of the water-soluble organic solvent; phosphate ions; nitrate ions; and zinc ions.

Abstract: The present invention is to provide an aqueous agent for treating metal surfaces that can carry out degreasing and forming a zinc phosphate coat simultaneously.

Abstract: A transaction processing apparatus includes a transaction processing terminal for registering data related to transaction processing, an external memory connected to the transaction processing terminal for collecting and storing the data related to transaction processing registered by the transaction processing terminal and a monitoring terminal connected to the external memory for periodically accessing and monitoring the external memory. The transaction processing terminal inhibits data transmission to the external memory when transmission of the data related to transaction processing to the external memory goes defective. The monitoring terminal transmits a signal for releasing the inhibition of data transmission to the transaction processing terminal when the data transmission between the transaction processing terminal and the external memory goes defective and then the data transmission is restored to a normal state.