# Relationship history for MSHA mine 2100651

Current hierarchy: **GCC SAB de CV → GCC Ready Mix → Caldwell Pit**

- 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:** Windom Ready Mix → Caldwell Pit; 1950-01-01 to 2010-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Bosshart Company → Caldwell Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bosshart Company → Windom Ready Mix; 1950-01-01 to 2010-05-14; source msha-controller-operator-history
- **controller_controls_mine:** GCC SAB de CV → Caldwell Pit; 2006-01-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** GCC Ready Mix → Caldwell Pit; 2010-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GCC SAB de CV → GCC Ready Mix; 2010-05-15 to current/open; source msha-controller-operator-history