# Relationship history for MSHA mine 0405633

Current hierarchy: **Vulcan Materials Company → North American Recycling and Crushing, LLC → Portable Plant 7**

- 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:** Dan  Copp → Portable Plant 7; 1995-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dan Copp Crushing Corp → Portable Plant 7; 2005-04-01 to 2018-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Copp → Dan Copp Crushing Corp; 2005-04-01 to 2018-10-16; source msha-controller-operator-history
- **operator_operates_mine:** North American Recycling and Crushing, LLC → Portable Plant 7; 2018-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Portable Plant 7; 2018-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → North American Recycling and Crushing, LLC; 2018-10-17 to current/open; source msha-controller-operator-history