# Relationship history for MSHA mine 1502448

Current hierarchy: **Oakland Coal Company → Oakland Coal Company → No 11-C 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

- **operator_operates_mine:** Oakland Coal Company → No 11-C Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oakland Coal Company → No 11-C Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oakland Coal Company → Oakland Coal Company; 1950-01-01 to current/open; source msha-controller-operator-history