# Relationship history for MSHA mine 0101509

Current hierarchy: **Concord Alton → Nu-Way Coal Company Inc → No 1 Strip 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Nu-Way Coal Company Inc → No 1 Strip Pit; 1976-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Concord Alton → No 1 Strip Pit; 1976-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Concord Alton → Nu-Way Coal Company Inc; 1976-04-20 to current/open; source msha-controller-operator-history