Davenport-based Per Mar Security Services has acquired All Channel Electronics based in Madison, Wis., the Corridor Business Journal reported. Rich and Pat Gmeinder, owners of All Channel Electronics, are retiring, and All Channel Electronics’ employees will be joining Per Mar. “Rich Gmeinder has spent his career working in and building All Channel, and we are grateful that he and his wife, Pat, trust Per Mar to serve the customers they have earned over the past 50 years,” Brian Duffy, Per Mar chief operating officer, said in a release. Established in 1953, Per Mar Security Services is the largest family-owned full-service security company in the Midwest with more than 2,400 team members, operating in 22 branch locations and 17 satellite locations.