# Relationship history for MSHA mine 1300632

Current hierarchy: **Rasmussen Group Inc → Ideal Ready Mix Company Inc → Brockman Sand**

- 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:** Brockman Sand Company → Brockman Sand; 1950-01-01 to 2000-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Michael A  Brockman → Brockman Sand; 1950-01-01 to 2000-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Brockman → Brockman Sand Company; 1950-01-01 to 2000-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Holding Company → Brockman Sand; 1984-06-13 to 2024-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Brockman Sand → Brockman Sand; 2000-09-01 to 2013-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Holding Company → Brockman Sand; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Holding Company → Brockman Sand; 2000-09-01 to 2013-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Ideal Ready Mix Company Inc → Brockman Sand; 2013-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Holding Company → Ideal Ready Mix Company Inc; 2013-05-29 to 2024-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Rasmussen Group Inc → Brockman Sand; 2024-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rasmussen Group Inc → Ideal Ready Mix Company Inc; 2024-04-19 to current/open; source msha-controller-operator-history