# Relationship history for MSHA mine 0202451

Current hierarchy: **Gabriel  DeAnda → Cantera Materials L.L.C. → Cantera Materials Crushing 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

- **operator_operates_mine:** Ke & G Development → Cantera Materials Crushing Plant; 1988-08-01 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Karol  George → Cantera Materials Crushing Plant; 1988-08-01 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Karol  George → Ke & G Development; 1988-08-01 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Abelardo  De Anda → Cantera Materials Crushing Plant; 1988-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** AZ Con Agg → Cantera Materials Crushing Plant; 1989-10-01 to 2011-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Abelardo  De Anda → AZ Con Agg; 1989-10-01 to 2011-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Cantera Materials L.L.C. → Cantera Materials Crushing Plant; 2011-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gabriel  DeAnda et al → Cantera Materials Crushing Plant; 2011-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gabriel  DeAnda et al → Cantera Materials L.L.C.; 2011-06-27 to current/open; source msha-controller-operator-history