Two bacterial strains deficient in endogenous adenylate cyclase activity are provided. A Ti film 116, a TiN film 115 and a pad metal film 117 are formed in this sequence on the upper surface of a Cu interconnect 112. The gas mixture is obtained by adding a defined amount of hydrogen to nitrogen andor argon, immediately before the gas mixture is introduced into said torch. In a first mode of operation, the first attachment point is attached to the second attachment point so that a first segment of the strap located between the first attachment point and the second attachment point forms a loop configured to secure a cord that is wrapped around the case.