# Relationship history for MSHA mine 3901688

Current hierarchy: **Tyler Allen Pickard; Somer Dawn Pickard → Pickard Gravel LLC → Rutland Pit**

- 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

- **operator_operates_mine:** Pickard Gravel LLC → Rutland Pit; 2025-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Somer Dawn Pickard et al → Rutland Pit; 2025-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Somer Dawn Pickard et al → Pickard Gravel LLC; 2025-01-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tyler Allen Pickard et al → Pickard Gravel LLC; 2025-01-07 to current/open; source msha-controller-operator-history