1.5M Ohm 1/4W Resistor homogeneous film of metal alloy is deposited on a high grade ceramic body. After a helical groove has been cut in the resistive layer, tinned connecting leads of electrolyticcopper are welded to the end-caps. The resistors are coated with a colored lacquer (light-bluefor type SFR16S; light-green for type SFR25 and red-brown for type SFR25H) which provides electrical, mechanical, and climatic protection.
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