# Relationship history for MSHA mine 4201955

Current hierarchy: **Fayette  McFarland; Sidney  Hullinger → Mc Farland & Hullinger → Stocks Sand & Gravel**

- 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

- **controller_controls_mine:** Sidney  Hullinger et al → Stocks Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Farland & Hullinger → Stocks Sand & Gravel; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sidney  Hullinger et al → Mc Farland & Hullinger; 1985-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fayette  McFarland et al → Mc Farland & Hullinger; 1985-08-01 to current/open; source msha-controller-operator-history