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By Alexandria Sage and Paul Lienert SAN FRANCISCO/DETROIT(Reuters) – Google's self-driving car team is expanding and hiring more people with automotive industry expertise, underscoring the company's determination to move the division past the experimental stage. The operation now employs at least 170 workers, according to a Reuters review of their profiles on LinkedIn, the business-oriented social network. Many are software and systems engineers, and some come from other departments at Google.