# Relationship history for MSHA mine 1700791

Current hierarchy: **Wendall M  Card Jr; Lisa L  Card → Card's Excavation & Tractor Work, Inc → Card's Pit**

- 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:** Card's Construction Company Inc → Card's Pit; 2005-11-08 to 2008-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Wendall M  Card Sr → Card's Pit; 2005-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wendall M  Card Sr → Card's Construction Company Inc; 2005-11-08 to 2008-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Card's Excavation & Tractor Work, Inc → Card's Pit; 2008-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wendall M  Card Jr  et al → Card's Pit; 2008-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wendall M  Card Jr  et al → Card's Excavation & Tractor Work, Inc; 2008-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lisa L  Card  et al → Card's Excavation & Tractor Work, Inc; 2008-07-24 to current/open; source msha-controller-operator-history