# Relationship history for MSHA mine 3002764

Current hierarchy: **David  Spallina → Spallina Materials Inc → Mendon 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Joseph  Spezio → Mendon Plant; 1981-11-18 to 2013-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Elam Sand & Gravel Corp → Mendon Plant; 1986-11-01 to 2004-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Spezio → Elam Sand & Gravel Corp; 1986-11-01 to 2004-03-01; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Mendon Plant; 2000-06-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** The Dolomite Group → Mendon Plant; 2004-03-02 to 2017-05-04; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → The Dolomite Group; 2004-03-02 to 2017-05-04; source msha-controller-operator-history
- **controller_controls_mine:** David  Spallina → Mendon Plant; 2006-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Loretta J  Spezio → Mendon 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 2004-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Spallina Materials Inc → Mendon Plant; 2017-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Spallina → Spallina Materials Inc; 2017-05-05 to current/open; source msha-controller-operator-history