# Relationship history for MSHA mine 1201629

Current hierarchy: **York Eugene R → York Coal Company Inc → Benham Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** York Coal Company Inc → Benham Pit; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** York Eugene R → Benham Pit; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** York Eugene R → York Coal Company Inc; 1978-03-01 to current/open; source msha-controller-operator-history