74493557
Feb 23, 1994
Jun 11, 1996
hydraulically powered motors for underground drilling machines; hydraulically powered mud motors for underground drilling machines, and technology used in connection thereof, namely drive shafts for universal joints, adjustable bent housing, adjustable bent sub, dump sub, and crossover sub
Machineryoil well, gas well and water well drilling; drilling for the installation of underground communications cables, natural gas pipelines, water and sewage pipes, and drilling for the installation of other subterranean infrastructure
Building Construction and Repair