# Relationship history for MSHA mine 1302181

Current hierarchy: **Rasmussen Group Inc → Viking Aggregates, Inc. → Lee County 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

- **controller_controls_mine:** Johnson Holding Company → Lee County Sand & Gravel; 1984-06-13 to 2024-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Shipley Contracting Corp. → Lee County Sand & Gravel; 1991-03-01 to 2016-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Leonard  Shipley → Lee County Sand & Gravel; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Shipley → Shipley Contracting Corp.; 1991-03-01 to 2016-03-23; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Holding Company → Lee County Sand & Gravel; 1991-03-15 to 2024-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Ideal Ready Mix Company, Inc. → Lee County Sand & Gravel; 2016-03-24 to 2025-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Holding Company → Ideal Ready Mix Company, Inc.; 2016-03-24 to 2024-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Rasmussen Group Inc → Lee County Sand & Gravel; 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. → Lee County Sand & Gravel; 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