# Relationship history for MSHA mine 2000003

Current hierarchy: **Kevin Ford  Manne → R E Glancy Inc → Arenac County Pit**

- 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:** Robert E  Glancy  et al → Arenac County Pit; 1950-01-01 to 2024-01-26; source msha-controller-operator-history
- **operator_operates_mine:** Arenac County Road Commission → Arenac County Pit; 1950-01-01 to 1981-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Arenac County - Mi → Arenac County Pit; 1950-01-01 to 1981-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Arenac County - Mi → Arenac County Road Commission; 1950-01-01 to 1981-03-17; source msha-controller-operator-history
- **operator_operates_mine:** R E Glancy Inc → Arenac County Pit; 1981-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Glancy  et al → R E Glancy Inc; 1981-03-18 to 2024-01-26; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Glancy et al → R E Glancy Inc; 1981-03-18 to 2024-01-26; source msha-controller-operator-history
- **controller_controls_mine:** Kevin Ford  Manne → Arenac County Pit; 2024-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin Ford  Manne → R E Glancy Inc; 2024-01-27 to current/open; source msha-controller-operator-history