I want to know the answer to the following question:
Companies such as Ford, IBM, Lucent, Samsung and SAP have built what in Nanjing?
All the background I'm provided with is that "The city has also attracted foreign investment, multinational firms such as Siemens, Ericsson, Volkswagen, Iveco, A.O. Smith, and Sharp have established their lines, and a number of multinationals such as Ford, IBM, Lucent, Samsung and SAP established research center there.". Is that enough to answer the question?