# Relationship history for MSHA mine 3500089

Current hierarchy: **Kathy  Kling → Conser Quarry Co → Conser 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:** Conser Quarry Co → Conser Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George  Tracer → Conser Quarry; 1950-01-01 to 2018-05-20; source msha-controller-operator-history
- **controller_controls_operator:** George  Tracer → Conser Quarry Co; 1950-01-01 to 2018-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Kathy  Kling → Conser Quarry; 2018-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathy  Kling → Conser Quarry Co; 2018-05-21 to current/open; source msha-controller-operator-history