# Relationship history for MSHA mine 0301579

Current hierarchy: **Aggregate Industries PLC → Mid-State Construction & Materials Inc → Taylor 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:** Sam R  Clark → Taylor Quarry; 1950-01-01 to 1988-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Mid-State Construction & Materials Inc → Taylor Quarry; 1984-09-01 to 1988-03-13; source msha-controller-operator-history
- **controller_controls_operator:** Sam R  Clark → Mid-State Construction & Materials Inc; 1984-09-01 to 1988-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Mid-State Construction & Materials Inc → Taylor Quarry; 1988-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Taylor Quarry; 1988-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Mid-State Construction & Materials Inc; 1988-03-14 to current/open; source msha-controller-operator-history