# Relationship history for MSHA mine 4003556

Current hierarchy: **Armada Materials LLC → VOLUNTEER SAND AND GRAVEL → HURRICANE MILLS**

- 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:** VOLUNTEER SAND AND GRAVEL → HURRICANE MILLS; 2021-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** D Todd  Carson et al → HURRICANE MILLS; 2021-07-13 to 2025-02-28; source msha-controller-operator-history
- **controller_controls_operator:** D Todd  Carson et al → VOLUNTEER SAND AND GRAVEL; 2021-07-13 to 2025-02-28; source msha-controller-operator-history
- **controller_controls_operator:** W Chad  Swallows et al → VOLUNTEER SAND AND GRAVEL; 2021-07-13 to 2025-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Armada Materials LLC → HURRICANE MILLS; 2025-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Armada Materials LLC → VOLUNTEER SAND AND GRAVEL; 2025-03-01 to current/open; source msha-controller-operator-history