# Relationship history for MSHA mine 5001997

Current hierarchy: **Drew  McLaughlin → Ridge Contracting Inc → Eagle Horizontal Crusher 1000-15-CC**

- 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

- **operator_operates_mine:** Ridge Contracting Inc → Eagle Horizontal Crusher 1000-15-CC; 2013-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Drew  McLaughlin → Eagle Horizontal Crusher 1000-15-CC; 2013-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Drew  McLaughlin → Ridge Contracting Inc; 2013-08-26 to current/open; source msha-controller-operator-history