and other substation equipment to meet its customer's needs. The Transmission Line Manufacturing division provides a complete line of engineered, tapered steel poles, steel davit arms... Electric distribution products. MDH's Packaged Substations are engineered and designed to meet the owners' requirements and delivered to the site complete for immediate installation..., PT's, CCVT's, lighting, station service transformer, bus, connectors, jumpers, and other associated hardware. In-house, engineered design of structures, foundations, and bus, along...