# Relationship history for MSHA mine 4801044

Current hierarchy: **Oftedal W T → E H Oftedal & Sons Inc → Pso Mine N0 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:** Ash Creek Mining Company → Pso Mine N0 1; 1976-01-01 to 1995-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Central & South West → Pso Mine N0 1; 1976-01-01 to 1995-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Central & South West → Ash Creek Mining Company; 1976-01-01 to 1995-07-31; source msha-controller-operator-history
- **operator_operates_mine:** E H Oftedal & Sons Inc → Pso Mine N0 1; 1995-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oftedal W T → Pso Mine N0 1; 1995-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oftedal W T → E H Oftedal & Sons Inc; 1995-08-01 to current/open; source msha-controller-operator-history