# Relationship history for MSHA mine 2100591

Current hierarchy: **Brandon  McNeilus → Builders Sand & Gravel → Ready Mix Sand & Gravel**

- 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:** Fraser Construction Company → Ready Mix Sand & Gravel; 1950-01-01 to 1985-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Lowell  Penz → Ready Mix Sand & Gravel; 1950-01-01 to 1985-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Lowell  Penz → Fraser Construction Company; 1950-01-01 to 1985-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Builders Sand & Gravel → Ready Mix Sand & Gravel; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brandon  McNeilus → Ready Mix Sand & Gravel; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brandon  McNeilus → Builders Sand & Gravel; 1985-10-01 to current/open; source msha-controller-operator-history