U.S. Oil Filled Distribution Transformer Market Size By Core (Closed, Shell, Berry), By Winding (Two Winding, Auto Transformer), By Phase (Three, Single), By Rating (≤ 250 kVA, > 250 kVA to ≤ 1 MVA, > 1 MVA), By Mounting (Pad, Pole), By Application (Residential & Commercial, Utility, Industrial), Industry Analysis Report, Country Outlook, Application Potential, Covid-19 Impact Analysis, Competitive Market Size & Forecast, 2021 - 2027