# Relationship history for MSHA mine 0502797

Current hierarchy: **Ed  Benson; Dwight  Benson → Benson Brothers Aggregate → Benson Brothers Aggregate**

- 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:** Hallenbeck Construction Inc → Benson Brothers Aggregate; 1950-01-01 to 1984-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Clyde  Hallenbeck → Benson Brothers Aggregate; 1950-01-01 to 1984-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Clyde  Hallenbeck → Hallenbeck Construction Inc; 1950-01-01 to 1984-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Benson Brothers Aggregate → Benson Brothers Aggregate; 1984-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dwight  Benson  et al → Benson Brothers Aggregate; 1984-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dwight  Benson  et al → Benson Brothers Aggregate; 1984-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ed  Benson  et al → Benson Brothers Aggregate; 1984-04-12 to current/open; source msha-controller-operator-history