NEW YORK--(BUSINESS WIRE)--Halper Sadeh LLC, an investor rights law firm, is investigating whether the merger of Farmers National Banc Corp. (NASDAQ: FMNB) and Middlefield Banc Corp. is fair to Farmers shareholders. Halper Sadeh encourages Farmers shareholders to click here to learn more about their legal rights and options or contact Daniel Sadeh or Zachary Halper at (212) 763-0060 or sadeh@halpersadeh.com or zhalper@halpersadeh.com. The investigation concerns whether Farmers and its board vio. ...