# Relationship history for MSHA mine 0401986

Current hierarchy: **Ronald W Pharris → C L Pharris Sand & Gravel Inc → Redlands 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

- **operator_operates_mine:** Livingston-Graham → Redlands Plant; 1950-01-01 to 1986-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Gulf + Western Industries Inc → Redlands Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gulf + Western Industries Inc → Livingston-Graham; 1950-01-01 to 1986-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Ronald W Pharris → Redlands Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C L Pharris Sand & Gravel Inc → Redlands Plant; 1986-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W Pharris → C L Pharris Sand & Gravel Inc; 1986-02-14 to current/open; source msha-controller-operator-history