# Relationship history for MSHA mine 2401487

Current hierarchy: **Willison Gene L → Gene L Willison → Gene L Willison**

- 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

- **operator_operates_mine:** Ed Burtch → Gene L Willison; 1980-01-01 to 1980-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Burtch Ed → Gene L Willison; 1980-01-01 to 1980-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Burtch Ed → Ed Burtch; 1980-01-01 to 1980-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Indian Creek Development Inc → Gene L Willison; 1980-05-20 to 1984-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Bayles R G → Gene L Willison; 1980-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bayles R G → Indian Creek Development Inc; 1980-05-20 to 1984-09-05; source msha-controller-operator-history
- **operator_operates_mine:** Gene L Willison → Gene L Willison; 1984-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Willison Gene L → Gene L Willison; 1984-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willison Gene L → Gene L Willison; 1984-09-06 to current/open; source msha-controller-operator-history