Apple's (AAPL) launch of its third-generation iPad on Wednesday could benefit an array of companies in stock market sectors from semiconductors to test gear. Apple sold 15.43 million iPads last quarter alone. The new iPad has three key upgrades: its display, processor and wireless capability, Piper Jaffray analyst Gene Munster notes in research issued after the new iPad was introduced. Seven stocks that he sees potentially benefiting from the new