A sealing of pipe repair clamps is taught providing a flexible inner sheet or sleeve adapted for duty inside a pipe repair clamp to prevent leakage of the fluid to be transported in a pipeline. A bend arm extends rearward from the reverse bend segment and is adapted to support a leading \u201csalvage\u201d edge of a fabric sheet that is displayed on the fabric arm so that a relatively clean \u201croll\u201d edge of the fabric is presented to viewers at a front end of the fabric arm adjacent the reverse bend segment. The upper cover includes a body and the lateral wall extended downward along the two lateral sides of the body, one end of each terminal extended to the upper cover to electrically contact with the chip module and the other end provided with easily fuse contact element. The invention is also directed to a population of catalyst particles having a desirable particle size distribution well-suited for realizing ideal fluidization and hydrodynamic characteristics. The downstream transmitter hub then synchronizes a clock of the upstream receiver hub with the clock of the downstream transmitter hub.