# Relationship history for MSHA mine 0504621

Current hierarchy: **Colas S A → Simon Contractors → Sterling Portable Screen #45**

- 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

- **controller_controls_mine:** Colas S A → Sterling Portable Screen #45; 1995-01-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** McAtee Paving Company → Sterling Portable Screen #45; 1998-06-01 to 2018-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Rhea Jerry L → Sterling Portable Screen #45; 1998-06-01 to 2002-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Rhea Jerry L → McAtee Paving Company; 1998-06-01 to 2002-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Sterling Portable Screen #45; 2002-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → McAtee Paving Company; 2002-05-15 to 2018-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Simon Contractors → Sterling Portable Screen #45; 2018-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Simon Contractors; 2018-05-30 to current/open; source msha-controller-operator-history