Harvard Bioscience, a Holliston company that makes life sciences equipment, has agreed to acquire a Minnesota-based firm that makes implantable devices for monitoring blood glucose levels in lab animals. Under the deal, which was announced on Monday and is expected to close by early next month, Harvard Bioscience (Nasdaq: HBIO) said it would pay $70 million to buy Data Sciences International. The privately held, 180-employee company makes so-called "telemetry" systems that allow researchers...