# Relationship history for MSHA mine 2501217

Current hierarchy: **Lawrence G  Sinclair; Steven L  Sparr → Meadow Grove Sand & Gravel → Meadow Grove Sand & 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Meadow Grove Sand & Gravel → Meadow Grove Sand & Gravel LLC; 2004-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence G  Sinclair et al → Meadow Grove Sand & Gravel LLC; 2004-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence G  Sinclair et al → Meadow Grove Sand & Gravel; 2004-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven L  Sparr et al → Meadow Grove Sand & Gravel; 2004-02-01 to current/open; source msha-controller-operator-history