# Relationship history for MSHA mine 2003249

Current hierarchy: **Randall  Sanderson → Sanderson Sand & Gravel → Sanderson S & G**

- 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:** Sanderson Sand & Gravel → Sanderson S & G; 2002-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randall  Sanderson → Sanderson S & G; 2002-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall  Sanderson → Sanderson Sand & Gravel; 2002-07-31 to current/open; source msha-controller-operator-history