 Unlike assembled PCBs, the manufacture of a readymade PCB can be tracked with the help of its specific manufacturing design and serial number.Experts in the Physics Department of the Directorate of Forensic Sciences (DFS) in the Gujarat capital of Gandhinagar say the readymade PCB consists of two Philips Integrated Circuits (ICs), and some capacitors and resistors mounted on a circuit board in a particular order.An expert involved with the case said that as a result of such moves "We have short-listed the names of some companies that manufacture PCBs of these types.