 NEW YORK--BUSINESS WIRE--Halper Sadeh LLP, a global investor rights law firm, is investigating whether the sale of Lydall, Inc. NYSE: LDL to Unifrax for 62.10 per share in cash is fair to Lydall shareholders. Halper Sadeh encourages Lydall 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 or The investigation concerns whether Lydall and its board of dire 