# Relationship history for MSHA mine 4503448

Current hierarchy: **Guy W Copenhaver; Matt Lee Copenhaver → Copenhaver Construction, Inc. → Portable #1**

- 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:** Copenhaver Construction, Inc. → Portable #1; 2000-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Guy W Copenhaver  et al → Portable #1; 2000-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Guy W Copenhaver  et al → Copenhaver Construction, Inc.; 2000-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt Lee Copenhaver  et al → Copenhaver Construction, Inc.; 2000-07-01 to current/open; source msha-controller-operator-history