# Relationship history for MSHA mine 4607311

Current hierarchy: **Armstrong Alan → James Coal Company → Surface No 1 Mines**

- 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:** River Ridge Coals Inc → Surface No 1 Mines; 1987-06-01 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_mine:** James B  Simpkins → Surface No 1 Mines; 1987-06-01 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_operator:** James B  Simpkins → River Ridge Coals Inc; 1987-06-01 to 1990-07-31; source msha-controller-operator-history
- **operator_operates_mine:** River Ridge Coal Inc → Surface No 1 Mines; 1990-08-01 to 1995-01-02; source msha-controller-operator-history
- **controller_controls_mine:** NSM PLC → Surface No 1 Mines; 1990-08-01 to 1995-01-02; source msha-controller-operator-history
- **controller_controls_operator:** NSM PLC → River Ridge Coal Inc; 1990-08-01 to 1995-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Excavating Inc → Surface No 1 Mines; 1995-01-03 to 1996-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Latham Charles D → Surface No 1 Mines; 1995-01-03 to 1996-05-27; source msha-controller-operator-history
- **controller_controls_operator:** Latham Charles D → Appalachian Excavating Inc; 1995-01-03 to 1996-05-27; source msha-controller-operator-history
- **operator_operates_mine:** James Coal Company → Surface No 1 Mines; 1996-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Armstrong Alan → Surface No 1 Mines; 1996-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Armstrong Alan → James Coal Company; 1996-05-28 to current/open; source msha-controller-operator-history