# Relationship history for MSHA mine 2301584

Current hierarchy: **Turner Ben → Ben Turner Contracting Company Inc → Turner'S Ozark Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** John E Carter → Turner'S Ozark Sand & Gravel; 1950-01-01 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Carter John E → Turner'S Ozark Sand & Gravel; 1950-01-01 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Carter John E → John E Carter; 1950-01-01 to 1988-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Ben Turner Contracting Company Inc → Turner'S Ozark Sand & Gravel; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Turner Ben → Turner'S Ozark Sand & Gravel; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Turner Ben → Ben Turner Contracting Company Inc; 1989-01-01 to current/open; source msha-controller-operator-history