Abstract: A wireless communication device is provided which is capable of interfacing with a base station of a service provider and intended for occasional use without requiring a subscription with the service provider. The device uses a non-rechargeable replaceable power source with memory means non-detachably secured to and integral with said power source comprising information code for uniquely identifying said power means and a prepaid calling time period. After the prepaid calling time period of the wireless communication device is exhausted, the power source can be exchanged for a different power source having a new prepaid calling time period.

Abstract: A mold closing unit for an injection molding device includes a machine frame, a moving mold platen and a fixed mold platen joined by four guide rods at the corners of the plates, with the moving mold platen being moveable along the guide rods via hydraulic cylinders connected thereto and arranged in prolongation of the rod axes, and with the diameters of one pair of piston rods being smaller and with the diameters of another pair of piston rods being greater than the diameter of the identical guide rods so that the contact surfaces of the pistons of each hydraulic cylinder on the opening and the closing sides are of different sizes.