In the High Temperature Superconducting Materials & Devices group, the development of (Bi,Pb)2Sr2Ca2Cu3O10+x [Bi-2223] bulk tube/rod and current leads and long length tapes for high current transport was taken up. A pair of bulk tube (L=430mm, OD=48mm, ID=46mm) joint current leads carrying transport critical current of 85% of that of the individual tube carrying >1KA at 77K in self field has been developed. Optimization of preparation parameters to improve the transport current through the joint is in progress. Multi-filamentary Bi-2223 tapes (> 35 m long) having 7, 13 and 21 filaments carrying Ic ~7-10A at 77K in self-field have been developed. To understand the nature of pairing and in search of effective pinning centers, CESR studies of Bi-2223 samples doped with Pr (0-0.1M%) prepared under optimized conditions have been carried out at RT and 77K. Presence and disappearance of CESR signal along with Platzmann- Wolf lines at RT and 77K respectively confirms further the role of enhanced exchange interaction in this HTS system. Temperature/angular variation studies of this series are in progress. XRD, SEM of these samples have also been carried out. AC susceptibility and RT measurements of these samples showed a slight decrease in Tc from 112K for pure and 110K for 0.10M% Pr doped sample (Fig. 4.10). Transport Jc of bar-shaped samples (L=35mm,W=12mm,t=2mm) is in the range of 103 to 102A at 77K in self field.