Disclosed is a foundry mix containing an organic salt and its use to make foundry shapes by the warm-box, hot-box, no-bake, and cold-box process, the use of these foundry shapes to make metal castings, and the metal castings prepared by the process. The transport rollers are driven independently from the separating member so that multiple sheets may be separated from the stack before being transported. When transmitting an acoustic signal to an opposite user, the apparatus cancels the speech of the opposite user and the background sound from the broadcasting program, and thus, superior communication quality may be maintained. A method of controlling the robot includes measuring the operator input values using the plurality of sensors, processing the input values using the controller to thereby calculate the stiffness value, and automatically adjusting the level of control sensitivity over the robot using the stiffness value. The hole acceleration layer is formed of a material having a hole mobility that is higher than that of the hole injection layer. A carrier for refrigerated goods is held on each telescopic extension by an adapter that bridges the space between the carrier for refrigerated goods and the telescopic extension, the width of the space being at least equal to the width of the telescopic extension.