# Relationship history for MSHA mine 1510857

Current hierarchy: **Slone Roger & Robert → Flat Fork Coal Company Inc → No 2 Mine**

- 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:** Jim D  Akers et al → No 2 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sandy Lynn Coal Company Inc → No 2 Mine; 1977-10-01 to 1980-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Hall Charles & Hobert Webb Sr → No 2 Mine; 1977-10-01 to 1981-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Hall Charles & Hobert Webb Sr → Sandy Lynn Coal Company Inc; 1977-10-01 to 1980-03-19; source msha-controller-operator-history
- **operator_operates_mine:** A A & W Coals Inc → No 2 Mine; 1980-03-20 to 1981-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Jim D  Akers et al → A A & W Coals Inc; 1980-03-20 to 1981-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Akers et al → A A & W Coals Inc; 1980-03-20 to 1981-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Slone Roger & Robert → No 2 Mine; 1980-10-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Flat Fork Coal Company Inc → No 2 Mine; 1981-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Slone Roger & Robert → Flat Fork Coal Company Inc; 1981-04-06 to current/open; source msha-controller-operator-history