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PCE
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CPC Subgroup
B23H 9/18

Producing external conical surfaces or spikes (B23H9/08 takes precedence)

Full Title

Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects (heat treatment by cathodic discharge C21D1/38) > Producing external conical surfaces or spikes (B23H9/08 takes precedence)