Women-owned businesses flex their muscles as revenue gainers in Mass.

  It was a very good year for Worcester-based Coghlin Electrical Contractors Inc. The 13-year-old electrical contracting firm owned by Susan Mailman was the biggest year-over-year revenue gainer on the BBJ’s list of the Largest Minority/Women-Owned Businesses in Massachusetts ranking No. 3 this year. Coghlin Electrical’s revenue rose to $79 million in 2017 from $45.4…