# Relationship history for MSHA mine 0101563

Current hierarchy: **Cornelius Howard → Cornelius & Rush Coal Company Inc → Sand Rock Pit No 1**

- 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

- **controller_controls_mine:** Cornelius Howard → Sand Rock Pit No 1; 1975-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cornelius & Rush Coal Company Inc → Sand Rock Pit No 1; 1976-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornelius Howard → Cornelius & Rush Coal Company Inc; 1976-10-20 to current/open; source msha-controller-operator-history