# Relationship history for MSHA mine 1800624

Current hierarchy: **Renner John L Jr → Northwest Coal Company → Yoder Strip**

- 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

- **controller_controls_mine:** Renner John L Jr → Yoder Strip; 1974-05-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northwest Coal Company → Yoder Strip; 1976-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Renner John L Jr → Northwest Coal Company; 1976-09-20 to current/open; source msha-controller-operator-history