Massachusetts medical device companies continue to battle a proposed federal tax on device makers as lawmakers work to reconcile differences in the House and Senate versions of national healthcare overhaul legislation, the Boston Globe reports. The bill reported out of the Senate Finance Committee would raise $40 billion over 10 years from a tax based on the revenue of device manufacturers, and the bill approved by the House last weekend would raise about $20 billion from a 2.5% tax on a broader class of medical equipment. Device companies are pressing for an amendment that would eliminate the tax from the Senate legislation.