Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
CPC Subgroup
E21B 21/16

using gaseous fluids (E21B21/14 takes precedence)

Full Title

Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) > using gaseous fluids (E21B21/14 takes precedence)