National Oilwell hit by slow North American natgas drilling

April 26 (Reuters) - National Oilwell Varco Inc, the largest U.S. oilfield equipment provider, reported a larger-than-expected decline in quarterly profit as margins were squeezed and the North American market was softer than expected. Shares of the company fell 2.5 percent to $65.50 in early trade on the New York Stock Exchange on Friday. "We are very cautious about North America and continue to see headwinds here as pricing and volume remain under pressure and as demand for pressure p