The History of Armstrong: E.H. Armstrong founded Armstrong Supply in 1934. He repaired radios and sold appliances. Mr. Armstrong and his son-in-law George Carpenter, bought out a local plumbing contractor in 1969 and started C & L Mechanical. This allowed our company to get into the plumbing business. After Mr. Armstrong’s death in 1980, Armstrong Supply and C & L Mechanical were combined into Armstrong Mechanical. Armstrong Plumbing, Air & Electric has over 100 well trained employees working in five unique and specialized departments: Sheet Metal Shop, Sheet Metal Field, Plumbing, Installation and Service. The installation & Service departments have Commercial and Residential crews that take care of all heating, air conditioning and plumbing needs.