A precaching system identifies an object, such as a media file, that a user accesses and then analyzes a social graph of the user to identify social graph contacts that may be interested in the object. The sewing apparatus includes a cassette mount to which the thread cassette is detachably attached, a carrier carrying the thread cassette between an attachment start position and an attachment finish position in the cassette mount and a control device for electrically controlling rotation of a motor that moves the carrier. The test set may contain memory to locally store certain technical information, e. Other embodiments are also disclosed and claimed. The present invention is a biliary stent including a stent body, a tubular membrane on one end of the stent body and having a bile outflow port, and two support members which at one end are connected to the one end of the stent body and at the other end are connected to the vicinity of the bile outflow port.