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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
E21C 37/16

by fire-setting or by similar methods based on a heat effect (drilling by use of heat E21B7/14)

Full Title

Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C27/14) > by fire-setting or by similar methods based on a heat effect (drilling by use of heat E21B7/14)