# Relationship history for MSHA mine 1701037

Current hierarchy: **Wendall M  Card Jr; Lisa L  Card → Card's Excavation & Tractor Work → Robert's Rd 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

- **controller_controls_mine:** Wendall M  Card Jr  et al → Robert's Rd Quarry; 2008-07-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Card's Excavation & Tractor Work → Robert's Rd Quarry; 2020-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wendall M  Card Jr  et al → Card's Excavation & Tractor Work; 2020-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lisa L  Card  et al → Card's Excavation & Tractor Work; 2020-05-11 to current/open; source msha-controller-operator-history