# Relationship history for MSHA mine 1508698

Current hierarchy: **Hicks Steve & Irvin → Mousie Coal Corp → No 1 Surface**

- 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:** Hicks Steve & Irvin → No 1 Surface; 1975-06-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mousie Coal Corp → No 1 Surface; 1975-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hicks Steve & Irvin → Mousie Coal Corp; 1975-09-26 to current/open; source msha-controller-operator-history