Apparatus for drilling holes in earth surface
Autonomous rapid thermal ice penetrating method and system
Burners for flame jet drill
Continuous drilling of vertical boreholes by thermal processes:
Explosive water jet with precursor bubble
Flame drill channelling method and apparatus for reducing noise
Flame jet tool for drilling cross-holes
Flame jet tool for drilling to great depths
Hydro-mechanical device for underground drilling
Process and a device for establishing drilling holes
System for rapidly boring through materials
Thermal drilling device
Thermal drilling device
Thermochemical penetrator for ice and frozen soils