# Relationship history for MSHA mine 4606809

Current hierarchy: **Ferguson Thad → P A L Coal Inc → Mine No 3**

- 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

- **controller_controls_mine:** Ferguson Thad → Mine No 3; 1983-02-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P A L Coal Inc → Mine No 3; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ferguson Thad → P A L Coal Inc; 1984-06-01 to current/open; source msha-controller-operator-history