135900 ⎘
Other methods or devices for dislodging with or without loading by ultrasonics
ENHANCED EXTRACTION SYSTEM AND METHOD BASED ON ULTRASONIC EXCITATION AND ACID FRACTURING INTEGRATED PERMEABILITY ENHANCEMENT FOR COAL SEAM
#2Atmospheric asteroid miner/packager
#3Rock breaking seismic source and active source three-dimensional seismic combined advanced detection system using tunnel boring machine
#4ACOUSTIC SOURCE FRAGMENTATION SYSTEM FOR BREAKING GROUND MATERIAL