# Relationship history for MSHA mine 4702597

Current hierarchy: **Simon Tim & Dan → Simon Stone & Excavating → Simon 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Behnke & Geoghegan Crushing Inc → Simon Quarry; 1979-01-01 to 1980-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Geoghegan Timothy → Simon Quarry; 1979-01-01 to 1980-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Geoghegan Timothy → Behnke & Geoghegan Crushing Inc; 1979-01-01 to 1980-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Cyril H Simon Excavating → Simon Quarry; 1980-08-20 to 1983-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Simon Cyril H → Simon Quarry; 1980-08-20 to 1983-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Simon Cyril H → Cyril H Simon Excavating; 1980-08-20 to 1983-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Simon Stone & Excavating → Simon Quarry; 1983-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Simon Tim & Dan → Simon Quarry; 1983-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Simon Tim & Dan → Simon Stone & Excavating; 1983-05-02 to current/open; source msha-controller-operator-history