# Relationship history for MSHA mine 4406090

Current hierarchy: **Slemp Ronald → S & S Coal Company → No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** S & S Coal Company → No 1 Strip; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Slemp Ronald → No 1 Strip; 1984-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Slemp Ronald → S & S Coal Company; 1984-05-01 to current/open; source msha-controller-operator-history