By Karen Robes Meeks Seventy years ago, Jack Appelt used his refrigeration know-how to build a family business that could support the burgeoning demand for refrigeration services in cargo ships, the U.S. Navy and surrounding commercial markets in the Los Angeles Harbor area. Today, the business that Appelt built, Quality Refrigeration, celebrates seven decades as a go-to service company for marine and commercial HVACR systems for cargo ships, cruise lines, offshore oil platforms, industrial and commercial markets. It boasts one of the largest inventories of certified marine parts in stock on the West Coast. The business also remains a family…