# Relationship history for MSHA mine 4103665

Current hierarchy: **GCC SAB de CV → Sun City Redi-Mix → SAND 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:** Pofahl James W Jr → SAND PLANT; 1991-02-01 to 1997-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Sun City Redi-Mix Inc → SAND PLANT; 1991-03-01 to 1997-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Pofahl James W Jr → Sun City Redi-Mix Inc; 1991-03-01 to 1997-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Sun City Redi-Mix → SAND PLANT; 1997-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** GCC SAB de CV → SAND PLANT; 1997-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GCC SAB de CV → Sun City Redi-Mix; 1997-01-20 to current/open; source msha-controller-operator-history