# Relationship history for MSHA mine 3608305

Current hierarchy: **Lucas Robin-David A → J R & L Coal Company → No 2 Middle Split Slope**

- 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:** Larry  Madenford et al → No 2 Middle Split Slope; 1987-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** East Franklin Coal Company → No 2 Middle Split Slope; 1991-12-01 to 1992-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Madenford et al → East Franklin Coal Company; 1991-12-01 to 1992-02-02; source msha-controller-operator-history
- **operator_operates_mine:** J R & L Coal Company → No 2 Middle Split Slope; 1992-02-03 to 1997-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Lucas Robert T Et Al → No 2 Middle Split Slope; 1992-02-03 to 1997-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Lucas Robert T Et Al → J R & L Coal Company; 1992-02-03 to 1997-04-02; source msha-controller-operator-history
- **operator_operates_mine:** J R & L Coal Company → No 2 Middle Split Slope; 1997-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lucas Robin-David A Et Al → No 2 Middle Split Slope; 1997-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lucas Robin-David A Et Al → J R & L Coal Company; 1997-04-03 to current/open; source msha-controller-operator-history