# Relationship history for MSHA mine 4503766

Current hierarchy: **Guy W Copenhaver; Matt Lee Copenhaver → Copenhaver Construction Inc → Portable # 3**

- 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:** Matt Lee Copenhaver  et al → Portable # 3; 2000-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Copenhaver Construction Inc → Portable # 3; 2017-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt Lee Copenhaver  et al → Copenhaver Construction Inc; 2017-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Guy W Copenhaver  et al → Copenhaver Construction Inc; 2017-03-28 to current/open; source msha-controller-operator-history