# Relationship history for MSHA mine 4503269

Current hierarchy: **Waldow Family Enterprises Inc → North Clark Construction → Courtney 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

- **controller_controls_mine:** Willis R  Waldow → Courtney Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North Clark Construction → Courtney Pit; 1992-07-01 to 2008-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Willis R  Waldow → North Clark Construction; 1992-07-01 to 2008-11-30; source msha-controller-operator-history
- **operator_operates_mine:** North Clark Construction → Courtney Pit; 2008-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Waldow Family Enterprises Inc → Courtney Pit; 2008-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Waldow Family Enterprises Inc → North Clark Construction; 2008-12-01 to current/open; source msha-controller-operator-history