# Relationship history for MSHA mine 4801147

Current hierarchy: **Jeff  Hildebrand → Hilcorp Energy Company → North Tisdale Shaft No 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** U S Energy Corp → North Tisdale Shaft No 1; 1950-01-01 to 1978-06-13; source msha-controller-operator-history
- **controller_controls_mine:** U S Energy Corp → North Tisdale Shaft No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Energy Corp → U S Energy Corp; 1950-01-01 to 1978-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Conoco Inc → North Tisdale Shaft No 1; 1978-03-09 to 1981-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Conoco Inc → North Tisdale Shaft No 1; 1978-06-14 to 1981-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Conoco Inc → Conoco Inc; 1978-06-14 to 1981-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Conoco Inc → North Tisdale Shaft No 1; 1981-08-06 to 1984-10-17; source msha-controller-operator-history
- **controller_controls_mine:** EI DuPont De Nemours & Co Inc → North Tisdale Shaft No 1; 1981-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** EI DuPont De Nemours & Co Inc → Conoco Inc; 1981-08-06 to 1984-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Robert H Trent → North Tisdale Shaft No 1; 1982-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New Tech Oil Company → North Tisdale Shaft No 1; 1984-10-18 to 2006-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Robert H Trent → New Tech Oil Company; 1984-10-18 to 2006-02-28; source msha-controller-operator-history
- **operator_operates_mine:** RDG Oil & Gas LLC → North Tisdale Shaft No 1; 2006-03-01 to 2008-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey H  Wingerter et al → North Tisdale Shaft No 1; 2006-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey H  Wingerter et al → RDG Oil & Gas LLC; 2006-03-01 to 2008-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Tulloch et al → RDG Oil & Gas LLC; 2006-03-01 to 2008-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Hilcorp Energy Company → North Tisdale Shaft No 1; 2008-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Hildebrand → North Tisdale Shaft No 1; 2008-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Hildebrand → Hilcorp Energy Company; 2008-01-22 to current/open; source msha-controller-operator-history