# Relationship history for MSHA mine 1508935

Current hierarchy: **Johnny  Bowling → Four Rivers Coal Inc → Four Rivers Coal Inc**

- 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:** Keeton Coal Company → Four Rivers Coal Inc; 1975-01-01 to 1979-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Buford  Keeton → Four Rivers Coal Inc; 1975-01-01 to 1979-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Buford  Keeton → Keeton Coal Company; 1975-01-01 to 1979-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Charter Coal Company → Four Rivers Coal Inc; 1979-04-20 to 1986-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Charter Oil Company → Four Rivers Coal Inc; 1979-04-20 to 1986-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Charter Oil Company → Charter Coal Company; 1979-04-20 to 1986-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Donnie T  Hoskins et al → Four Rivers Coal Inc; 1983-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & N Coal Company Inc → Four Rivers Coal Inc; 1986-07-25 to 1988-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Donnie T  Hoskins et al → D & N Coal Company Inc; 1986-07-25 to 1988-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Four Rivers Coal Inc → Four Rivers Coal Inc; 1988-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnny  Bowling et al → Four Rivers Coal Inc; 1988-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnny  Bowling et al → Four Rivers Coal Inc; 1988-08-15 to current/open; source msha-controller-operator-history