# Relationship history for MSHA mine 0404869

Current hierarchy: **Cemex S A → Cemex Construction Materials LP → Redlands Quarry**

- 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:** Ronald W Pharris → Redlands Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C L Pharris Sand & Gravel Inc → Redlands Quarry; 1987-02-01 to 1992-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W Pharris → C L Pharris Sand & Gravel Inc; 1987-02-01 to 1992-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Redlands Quarry; 1990-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Construction Materials Inc → Redlands Quarry; 1992-01-18 to 2002-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Construction Materials Inc; 1992-01-18 to 2002-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Redlands Quarry; 2001-07-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cemex Construction Materials LP → Redlands Quarry; 2002-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Cemex Construction Materials LP; 2002-09-17 to current/open; source msha-controller-operator-history