Second, Figs. 5 and 6 show that each sector began patenting at a different time. Some sectors, such as Electronic & Electric, Chemicals, and Instruments, were active from the outset, while others, such as Transportation Equipment, entered later. The former sectors areal so those that patented in the technology architecture categories Battery Integration and Peripheral Components first (from 1990 on),while other sectors began no earlier than 1995 (e.g., Transportation Equipment).