# Relationship history for MSHA mine 3501037

Current hierarchy: **Hunt W W → Eldorado Oregon Corp → Virtue 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 → Virtue Mine; 1950-01-01 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Brandenthaler Anthony → Virtue 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 1979-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Chain O'Mines → Virtue Mine; 1979-11-01 to 1985-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Caldwell Harold D → Virtue Mine; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Caldwell Harold D → Chain O'Mines; 1979-11-01 to 1985-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Eldorado Oregon Corp → Virtue Mine; 1985-11-14 to 1986-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Berry C N → Virtue Mine; 1985-11-14 to 1986-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Berry C N → Eldorado Oregon Corp; 1985-11-14 to 1986-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Eldorado Oregon Corp → Virtue Mine; 1986-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hunt W W → Virtue Mine; 1986-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hunt W W → Eldorado Oregon Corp; 1986-08-26 to current/open; source msha-controller-operator-history