# Relationship history for MSHA mine 0203121

Current hierarchy: **Harley  Gray Jr → DRAKE STONE PRODUCTS INC → DIAMOND 7 OAK**

- 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

- **controller_controls_mine:** Harley  Gray Jr → DIAMOND 7 OAK; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Drake Stone Products Inc → DIAMOND 7 OAK; 2006-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harley  Gray Jr → Drake Stone Products Inc; 2006-04-20 to current/open; source msha-controller-operator-history