# Relationship history for MSHA mine 4105593

Current hierarchy: **Rasmussen Group Inc → Viking Aggregates → Hempstead 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

- **controller_controls_mine:** Johnson Holding Company → Hempstead Plant; 1991-03-15 to 2024-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Rasmussen Group Inc → Hempstead Plant; 2001-08-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials, Inc. → Hempstead Plant; 2021-11-22 to 2025-10-26; source msha-controller-operator-history
- **controller_controls_operator:** Rasmussen Group Inc → Hallett Materials, Inc.; 2021-11-22 to 2025-10-26; source msha-controller-operator-history
- **controller_controls_mine:** Rasmussen Group Inc → Hempstead Plant; 2024-04-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Viking Aggregates → Hempstead Plant; 2025-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Holding Company → Viking Aggregates; 2025-10-27 to 2024-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Rasmussen Group Inc → Viking Aggregates; 2025-10-27 to current/open; source msha-controller-operator-history