# Relationship history for MSHA mine 4601862

Current hierarchy: **Eastern Associated Coal Corp → Eastern Associated Coal Corp → Keystone No 3-B 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:** Eastern Associated Coal Corp → Keystone No 3-B Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eastern Associated Coal Corp → Keystone No 3-B Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eastern Associated Coal Corp → Eastern Associated Coal Corp; 1950-01-01 to current/open; source msha-controller-operator-history