# Relationship history for MSHA mine 3001386

Current hierarchy: **Loretta J  Spezio → Elam Sand & Gravel Corp → MT MORRIS PLANT**

- 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:** Joseph  Spezio → MT MORRIS PLANT; 1981-11-18 to 2013-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Elam Sand & Gravel Corp → MT MORRIS PLANT; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Spezio → Elam Sand & Gravel Corp; 2001-08-01 to 2013-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Loretta J  Spezio → MT MORRIS PLANT; 2013-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Loretta J  Spezio → Elam Sand & Gravel Corp; 2013-05-06 to current/open; source msha-controller-operator-history