# Relationship history for MSHA mine 3000830

Current hierarchy: **Joseph  Spezio → Regional Sand & Gravel Inc → Clover Gravel Products**

- 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:** Clover Gravel Products Inc → Clover Gravel Products; 1950-01-01 to 1987-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Randolph Leonard B → Clover Gravel Products; 1950-01-01 to 1987-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Randolph Leonard B → Clover Gravel Products Inc; 1950-01-01 to 1987-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Spezio → Clover Gravel Products; 1986-11-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Regional Sand & Gravel Inc → Clover Gravel Products; 1987-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Spezio → Regional Sand & Gravel Inc; 1987-07-20 to current/open; source msha-controller-operator-history