# Relationship history for MSHA mine 1300771

Current hierarchy: **Rasmussen Group Inc → Viking Aggregates, Inc. → Coppock Sand Plant**

- 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:** Ideal Sand Company → Coppock Sand Plant; 1950-01-01 to 1984-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Gary L  Yates → Coppock Sand Plant; 1950-01-01 to 1984-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Yates → Ideal Sand Company; 1950-01-01 to 1984-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Ideal Ready Mix Company, Inc. → Coppock Sand Plant; 1984-06-13 to 2025-11-04; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Holding Company → Coppock Sand Plant; 1984-06-13 to 2024-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Holding Company → Ideal Ready Mix Company, Inc.; 1984-06-13 to 2024-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Holding Company → Coppock Sand Plant; 1991-03-15 to 2024-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Rasmussen Group Inc → Coppock Sand Plant; 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 2025-11-04; source msha-controller-operator-history
- **operator_operates_mine:** Viking Aggregates, Inc. → Coppock Sand Plant; 2025-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Holding Company → Viking Aggregates, Inc.; 2025-11-05 to 2024-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Rasmussen Group Inc → Viking Aggregates, Inc.; 2025-11-05 to current/open; source msha-controller-operator-history