# Relationship history for MSHA mine 4703995

Current hierarchy: **Nathan J  Johnstad; Tonya M  Johnstad → PHOENIX GRAVEL LLC → PHOENIX GRAVEL LLC**

- 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:** PHOENIX GRAVEL LLC → PHOENIX GRAVEL LLC; 2026-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tonya M  Johnstad et al → PHOENIX GRAVEL LLC; 2026-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tonya M  Johnstad et al → PHOENIX GRAVEL LLC; 2026-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nathan J  Johnstad et al → PHOENIX GRAVEL LLC; 2026-05-07 to current/open; source msha-controller-operator-history