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PCE
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CPC Subgroup
G01V 1/116

where pressurised combustion gases escape from the generator in a pulsating manner, e.g. for generating bursts

Full Title

Seismology; Seismic or acoustic prospecting or detecting > Generating seismic energy > using explosive charges (G01V1/157 takes precedence) > where pressurised combustion gases escape from the generator in a pulsating manner, e.g. for generating bursts