To provide a magnetic tape loader with which undesirable slippage does not occur while a cartridge is insertedejected and carried, whose configuration is simple, and capable of being produced at a low cost. For example, the method includes forming a first mask layer and a second mask layer, modifying a material property in regions of the first and second mask layers, and forming the structure based on the modified regions. In an example, the detachable helical antenna can be configured to mechanically threadably engage an implantable medical device. Information from the database may then be used to determine the location of a wireless client based on new signal strength information from one or more sniffers. The first conveyor belt and the second conveyor belt form a holding and conveying channel. Finally, at least a portion of the intermediate article is trimmed off to form a final container.