# Relationship history for MSHA mine 4407428

Current hierarchy: **Jeffrey M Tourault; Greg  Span → Shore Materials LLC → Shore Materials 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:** Shore Materials LLC → Shore Materials LLC; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greg  Span et al → Shore Materials LLC; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Span et al → Shore Materials LLC; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey M Tourault et al → Shore Materials LLC; 2023-08-15 to current/open; source msha-controller-operator-history