A lens driving device has a carrier, a coil, an upper spring, a lower spring, a yoke, a magnet, and a lower member. r in the general formula represents a number of 1-100, Y1 is a diamine containing a R1R2NmNR3R4, piperazine or a diamine containing a piperazine ring, R2\u02dcR4 are a hydrogen atom, an alkyl group having 1-5 carbon atoms independently. The outer walls of the cassette includes mechanical indexing locations to ensure appropriate positioning when robotically removing storage racks or plates from the cassette. The second portion is positioned adjacent to the back substrate. The elevator group control apparatus selects an elevator whose total evaluated value is the best from among the plurality of elevators, and assigns a hall call to the selected elevator. The leaflets are made from a polymeric material and are moulded directly onto the stent so as to provide for continuous attachment thereof.