# Relationship history for MSHA mine 1201805

Current hierarchy: **Invesco International Corp → Invesco International Corp Of Alabama → Prairie Creek Mine No 15**

- 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:** Invesco International Corp → Prairie Creek Mine No 15; 1976-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Invesco International Corp Of Alabama → Prairie Creek Mine No 15; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Invesco International Corp → Invesco International Corp Of Alabama; 1980-09-01 to current/open; source msha-controller-operator-history