# Relationship history for MSHA mine 4502736

Current hierarchy: **Hamilton Reggie & Clair → Hamilton Rock Quarry Inc → Hamilton Adna Rock 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:** J C O'Connor Construction Inc → Hamilton Adna Rock Quarry; 1979-01-01 to 1988-09-12; source msha-controller-operator-history
- **controller_controls_mine:** James C O'Connor → Hamilton Adna Rock Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James C O'Connor → J C O'Connor Construction Inc; 1979-01-01 to 1988-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Hamilton Rock Quarry Inc → Hamilton Adna Rock Quarry; 1988-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Reggie & Clair Et Al → Hamilton Adna Rock Quarry; 1988-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Reggie & Clair Et Al → Hamilton Rock Quarry Inc; 1988-09-13 to current/open; source msha-controller-operator-history