# Relationship history for MSHA mine 2902063

Current hierarchy: **Joseph  Gonzales → Gonzales Sand & Gravel → Torres Pit Gonzales Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Gonzales Sand & Gravel → Torres Pit Gonzales Sand & Gravel; 1990-09-01 to 2008-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Simon G  Gonzales → Torres Pit Gonzales Sand & Gravel; 1990-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Simon G  Gonzales → Gonzales Sand & Gravel; 1990-09-01 to 2008-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Gonzales Sand & Gravel → Torres Pit Gonzales Sand & Gravel; 2008-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Gonzales → Torres Pit Gonzales Sand & Gravel; 2008-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Gonzales → Gonzales Sand & Gravel; 2008-03-19 to current/open; source msha-controller-operator-history