# Relationship history for MSHA mine 1202327

Current hierarchy: **Stanley R  Stiers → STANLEY R. STIERS ENTERPRISES L.L.C. → STANLEY STIERS 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** STANLEY R. STIERS ENTERPRISES L.L.C. → STANLEY STIERS GRAVEL; 2002-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanley R  Stiers → STANLEY STIERS GRAVEL; 2002-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley R  Stiers → STANLEY R. STIERS ENTERPRISES L.L.C.; 2002-04-10 to current/open; source msha-controller-operator-history