# Relationship history for MSHA mine 3500646

Current hierarchy: **George S  Fan → Dewmount Boise Corp → Gray Eagle 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Chemical Lime Company → Gray Eagle Mine; 1950-01-01 to 1992-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Brandenthaler Anthony → Gray Eagle Mine; 1950-01-01 to 1992-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Brandenthaler Anthony → Chemical Lime Company; 1950-01-01 to 1992-11-17; source msha-controller-operator-history
- **controller_controls_mine:** George S  Fan → Gray Eagle Mine; 1992-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dewmount Boise Corp → Gray Eagle Mine; 1992-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George S  Fan → Dewmount Boise Corp; 1992-11-18 to current/open; source msha-controller-operator-history