# Relationship history for MSHA mine 1511266

Current hierarchy: **Durr R C → River Mining Company Inc → No 11 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

- **controller_controls_mine:** Durr R C → No 11 Surface; 1974-04-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Mining Company Inc → No 11 Surface; 1978-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Durr R C → River Mining Company Inc; 1978-06-01 to current/open; source msha-controller-operator-history