# Relationship history for MSHA mine 4605287

Current hierarchy: **Ferguson William G & Eugene S Sikora → Witcher Creek Coal Company Inc → No 1 Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Dailey Richard L → No 1 Mine; 1976-09-01 to 1979-10-05; source msha-controller-operator-history
- **operator_operates_mine:** Witcher Creek Coal Company Inc → No 1 Mine; 1976-09-15 to 1979-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Dailey Richard L → Witcher Creek Coal Company Inc; 1976-09-15 to 1979-10-05; source msha-controller-operator-history
- **operator_operates_mine:** Witcher Creek Coal Company Inc → No 1 Mine; 1979-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ferguson William G & Eugene S Sikora → No 1 Mine; 1979-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ferguson William G & Eugene S Sikora → Witcher Creek Coal Company Inc; 1979-10-06 to current/open; source msha-controller-operator-history