Matches 201 - 250 out of 263 < 1 2 3 4 5 6 >
Match Document Document Title
3386520 Apparatus for anchoring the pilot member in a pilot bore  
3383138 Tunneling machine with stepper advance and articulated torque arms  
3382002 Rotary cutter wheel tunneling machine  
3380260 Tunnel-boring machine  
3379024 Machine for constructing lined ducts through rock  
3377105 Protective overhead shield for tunneling machine and method  
3370431 Mine roof supports  
3363945 Propulsion system for continuous mining machine  
3355215 Oscillating tunneling machine  
3355213 Mine roof supports and conveyors for use in conjunction therewith  
3346055 Augering machine for mining upwardly and downwardly at steep angles  
3345108 Tunneling machine steering system  
3343878 Rotary tunneling machine having resiliently mounted vibrated kerf cutter  
3332721 Device having adjustable knives for forming tunnels in soil  
3330368 Peristaltic gopher  
3325218 Earth boring machine  
3325217 Tunneling and excavation through rock by core forming and removal  
3320001 Self-advancing mine roof supports and control means therefor  
3314722 Mining machine with rotary cutter horizontally slidable on vertically adjustable guide  
3306663 Heading and ripping machines for mining  
3295892 Steerable tunnel-drilling machine  
3280570 Coal face man-riding carriage  
3266257 Shield tunneling method and mechanism  
3205014 Rotary tunneling machine having off-set head  
3203737 Rock driling machine  
3185225 Feeding apparatus for down hole drilling device  
3169796 Continuous miner having pivotally mounted head  
3143862 Support of roofs in mines  
3134580 Tunnel machine  
3114425 Stepper-type tramming support for mining equipment  
3106825 Mining apparatus and advancing means therefor  
3105561 Hydraulic actuated drill collar  
3097829 Roof support in mines  
3091439 Auger mining machine  
3061289 Rotary head tunneling machine  
3061288 Steering means for rotary head tunneling machine  
3061287 Feeding means for rotary head tunneling machine  
3055447 Mining machine with stepper mechanism  
2988348 Rotary tunneling machines  
2979320 Tiltable deep mining auger machine  
2955808 Tunneling machine having stepper type advancing means  
2935309 Mining machine having independently operable skids  
2925258 Tunnel boring machine having torsion counteracting means  
2919121 Mining and excavating machine of the rotary type  
2916274 Mining machine having an arcuate cutter feed  
2910283 Continuous mining apparatus having core forming means and multiple core dislodging devices  
2872170 Mining machine launching device  
2868527 Continuous mining machine  
2864600 Mining machine  
2864599 Tunnel boring machine having oppositely rotating heads  
Matches 201 - 250 out of 263 < 1 2 3 4 5 6 >