Bangalore: At least half-dozen major corporations in the U.S. like Tyco International (TYC) and Ingersoll-Rand (IR) have proposed reincorporating in Ireland or Switzerland since October because of the U.S. President Barack Obama's plans to clamp down on corporate overseas tax maneuvering, reports Business WeekThis is because both Ireland and Switzerland offer big tax savings than the U.S. or Europe. Also, both of the countries have well-established tax treaties, which decide which country has primary taxing rights and help avoid double taxation....