# Relationship history for MSHA mine 4503012

Current hierarchy: **Allen  Matovich → ALBAR Industrial Minerals → Bruce Creek Mine**

- 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:** Asea Brown Boveri Ltd (ABB) → Bruce Creek Mine; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C-E Minerals Inc → Bruce Creek Mine; 1983-09-01 to 2012-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Asea Brown Boveri Ltd (ABB) → C-E Minerals Inc; 1983-09-01 to 2012-05-23; source msha-controller-operator-history
- **operator_operates_mine:** ALBAR Industrial Minerals → Bruce Creek Mine; 2012-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Allen  Matovich et al → Bruce Creek Mine; 2012-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen  Matovich et al → ALBAR Industrial Minerals; 2012-05-24 to current/open; source msha-controller-operator-history