# Relationship history for MSHA mine 5001831

Current hierarchy: **Becharof Corporation → BC Contractors Inc → CEC Minyu Jaw Crusher**

- 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:** BC Contractors Inc → CEC Minyu Jaw Crusher; 2006-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Becharof Corporation  et al → CEC Minyu Jaw Crusher; 2006-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Becharof Corporation  et al → BC Contractors Inc; 2006-02-10 to current/open; source msha-controller-operator-history