electric fan controls boards circuit boarding processing production pcb proofing usb multi-function main control board

processing custom:yes item no:372 brand name:lingbang model:372 mechanical rigidity:rigidity number of layers:double-sided base material:copper insulation material:organic resin insulation layer thickness:conventional board flame retardant properties :vo board processing technology:electrolytic foil reinforcement material:glass fiber cloth base.syi