Question: In January 2016  Precision Castparts Corp. became a sibsidiary of a multinational conglomerate holding company headquartered where?
Sentence (from "Berkshire Hathaway"): Berkshire Hathaway has averaged an annual growth in book value of 19.0% to its shareholders since 1965 (compared to 9.7% from the S&P 500 with dividends included for the same period), while employing large amounts of capital, and minimal debt.
Relevant evidence: No