# Relationship history for MSHA mine 1504351

Current hierarchy: **Coal Ridge Fuels Of Hazard Inc → River Processing Inc → No 1 Surface**

- 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 Processing Inc → No 1 Surface; 1950-01-01 to 1987-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Elmer  Whitaker → No 1 Surface; 1950-01-01 to 1987-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Elmer  Whitaker → River Processing Inc; 1950-01-01 to 1987-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Coal Ridge Fuels Of Hazard Inc → No 1 Surface; 1983-12-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → No 1 Surface; 1987-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Ridge Fuels Of Hazard Inc → River Processing Inc; 1987-04-22 to current/open; source msha-controller-operator-history