# Relationship history for MSHA mine 2500838

Current hierarchy: **Fred  Beekman; Norma  Beekman → Homestead Trucking Inc → Homestead (Blue Spring 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Behrens Construction Company → Homestead (Blue Spring Pit); 1950-01-01 to 1984-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Constructors Inc (NE) → Homestead (Blue Spring Pit); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Constructors Inc (NE) → Behrens Construction Company; 1950-01-01 to 1984-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Homestead Trucking Inc → Homestead (Blue Spring Pit); 1984-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred  Beekman et al → Homestead (Blue Spring Pit); 1984-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Beekman et al → Homestead Trucking Inc; 1984-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norma  Beekman et al → Homestead Trucking Inc; 1984-05-10 to current/open; source msha-controller-operator-history