Surface drill rigs 2009 12,000 h United States
Surface drill rigs 1993 6,825 h United States, Oakland, California
Surface drill rigs United States, Mifflinburg, Pennsylvania
Surface drill rigs 1991 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1993 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1990 United States, Mifflinburg, Pennsylvania
Surface drill rigs 1969 United States, Mifflinburg, Pennsylvania