# Relationship history for MSHA mine 5001948

Current hierarchy: **Drew  McLaughlin → Ridge Contracting Inc → Ridge Crusher**

- 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:** Twin Peaks Construction → Ridge Crusher; 2010-09-15 to 2014-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Nikki  Baringer → Ridge Crusher; 2010-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nikki  Baringer → Twin Peaks Construction; 2010-09-15 to 2014-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Drew  McLaughlin → Ridge Crusher; 2013-08-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ridge Contracting Inc → Ridge Crusher; 2014-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Drew  McLaughlin → Ridge Contracting Inc; 2014-07-09 to current/open; source msha-controller-operator-history