Expendable protective sleeve and method of use for soil and grou
Extended soil sampling head
Externally vented drive head with solid center
Fluid powered rotary drilling assembly
Geotechnical cone lubrication apparatus and method
Ground boring apparatus
Ground piercing attachment for tractors
Ground probe apparatus
Ground water sampling device
Guide rail system for a power tool
High frequency vibratory systems for earth boring
Hole-making device
Hollow pole driver
Hydraulically operated subsoil displacement apparatus
Impact method and the device used in standard penetration test
Impact tool for tunneling
Impact-action self-propelled mechanism for driving holes in the
In situ reactor
Laser liner creation apparatus and method
Light weight underground pipe or cable installing device