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Construction. Weston Switchboard Wattmeters Synchroscopes and Power-Factor Meters. Weston Switchboard Indicating Wattmeters. Weston Switchboard Synchroscopes. Weston Switchboard Power Factor and Frequency Meters. Weston Switchboard Alternating Curr.. (Weston Electrical Instrument Co. Catalog, 16 Sections 1 through 7 with Price List)