# Relationship history for MSHA mine 4300350

Current hierarchy: **Fred  Whitridge → Evergreen Slate Company Inc → MCCARTHY 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

- **operator_operates_mine:** Calder Slate Company → MCCARTHY QUARRY; 1980-10-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Howard V  Lawrence → MCCARTHY QUARRY; 1980-10-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Howard V  Lawrence → Calder Slate Company; 1980-10-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  Hill → MCCARTHY QUARRY; 1985-01-04 to 1988-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Slate Products Inc → MCCARTHY QUARRY; 1986-06-01 to 1988-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Hill → Slate Products Inc; 1986-06-01 to 1988-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Royal  Harrison → MCCARTHY QUARRY; 1988-04-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Slate Inc → MCCARTHY QUARRY; 1988-05-05 to 1988-12-05; source msha-controller-operator-history
- **controller_controls_operator:** Royal  Harrison → U S Slate Inc; 1988-05-05 to 1988-12-05; source msha-controller-operator-history
- **operator_operates_mine:** Red Slate Company Inc → MCCARTHY QUARRY; 1988-12-06 to 1991-05-24; source msha-controller-operator-history
- **controller_controls_mine:** John M  Maslack → MCCARTHY QUARRY; 1988-12-06 to 1991-05-24; source msha-controller-operator-history
- **controller_controls_operator:** John M  Maslack → Red Slate Company Inc; 1988-12-06 to 1991-05-24; source msha-controller-operator-history
- **operator_operates_mine:** Western Slate Inc → MCCARTHY QUARRY; 1991-05-25 to 2018-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey N  Harrison → MCCARTHY QUARRY; 1991-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey N  Harrison → Western Slate Inc; 1991-05-25 to 2018-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Evergreen Slate Company Inc → MCCARTHY QUARRY; 2018-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred  Whitridge → MCCARTHY QUARRY; 2018-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Whitridge → Evergreen Slate Company Inc; 2018-05-22 to current/open; source msha-controller-operator-history