# Relationship history for MSHA mine 0102188

Current hierarchy: **Burks William H & Curtis E Roberts → Alabama Mineral Inc → No 2**

- 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:** Griffin William T Jr → No 2; 1979-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Forest Hill Farms Inc → No 2; 1980-03-01 to 1980-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Griffin William T Jr → Forest Hill Farms Inc; 1980-03-01 to 1980-05-19; source msha-controller-operator-history
- **operator_operates_mine:** R & R Coal Company → No 2; 1980-05-20 to 1981-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Griffith Bobby G → No 2; 1980-05-20 to 1981-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Griffith Bobby G → R & R Coal Company; 1980-05-20 to 1981-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Alabama Mineral Inc → No 2; 1981-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burks William H & Curtis E Roberts → No 2; 1981-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burks William H & Curtis E Roberts → Alabama Mineral Inc; 1981-02-02 to current/open; source msha-controller-operator-history