# Relationship history for MSHA mine 3002863

Current hierarchy: **David  Spallina → Spallina Materials Inc → West Bloomfield Mine**

- 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 → West Bloomfield Mine; 1981-11-18 to 2013-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Elam Sand & Gravel Corp → West Bloomfield Mine; 1988-09-01 to 2016-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Spezio → Elam Sand & Gravel Corp; 1988-09-01 to 2013-05-05; source msha-controller-operator-history
- **controller_controls_mine:** David  Spallina → West Bloomfield Mine; 2006-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Loretta J  Spezio → West Bloomfield Mine; 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 2016-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Spallina Materials Inc → West Bloomfield Mine; 2016-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Spallina → Spallina Materials Inc; 2016-04-01 to current/open; source msha-controller-operator-history