# Relationship history for MSHA mine 3600246

Current hierarchy: **CRH PLC → Pennsy Supply Inc → Summit Station 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:** Summit Quarries Inc → Summit Station Quarry; 1950-01-01 to 1981-08-03; source msha-controller-operator-history
- **controller_controls_mine:** George  Sutcavage → Summit Station Quarry; 1950-01-01 to 1981-08-03; source msha-controller-operator-history
- **controller_controls_operator:** George  Sutcavage → Summit Quarries Inc; 1950-01-01 to 1981-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Summit Stone Inc → Summit Station Quarry; 1981-08-04 to 1989-09-27; source msha-controller-operator-history
- **controller_controls_mine:** McKinley  Hoover → Summit Station Quarry; 1981-08-04 to 1989-09-27; source msha-controller-operator-history
- **controller_controls_operator:** McKinley  Hoover → Summit Stone Inc; 1981-08-04 to 1989-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Summit Stone Inc → Summit Station Quarry; 1989-09-28 to 1995-08-15; source msha-controller-operator-history
- **controller_controls_mine:** George A  Walborn → Summit Station Quarry; 1989-09-28 to 1995-08-15; source msha-controller-operator-history
- **controller_controls_operator:** George A  Walborn → Summit Stone Inc; 1989-09-28 to 1995-08-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Summit Station Quarry; 1993-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pennsy Supply Inc → Summit Station Quarry; 1995-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pennsy Supply Inc; 1995-08-16 to current/open; source msha-controller-operator-history