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EFD20 Power Transformer Horizontal BobbinEFD20 high voltage transformer bobbin, single slot EFD20 transformer frame, 7+4 pins horizontal EFD20 coil former. Bobbin size=30.0X23.0mmX11.5mm. EFD20 bobbin phenolic material, we manufacture EFD20 transformers for power supplies, welcome customized electronic transformer.