FIELD: seismic prospecting. SUBSTANCE: pneumatic emitter has accumulation chamber with outlet port cyclically sealed from environment by means of piston provided with stepped projection and rectangular-section polymeric ring; two asymmetric annular grooves are made in ring and in case wall. EFFECT: enhanced reliability and continuous-running time; reduced manufacturing cost. 5 cl, 7 dwg
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Authors
Dates
2003-05-20—Published
2001-08-06—Filed