# Relationship history for MSHA mine 2700461

Current hierarchy: **Kenneth R  Clarke → Clarke & Co. Earthworks Contractors → Clarke & Co. Earthworks Contractors**

- 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:** Clarke & Co. Earthworks Contractors → Clarke & Co. Earthworks Contractors; 2012-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth R  Clarke → Clarke & Co. Earthworks Contractors; 2012-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth R  Clarke → Clarke & Co. Earthworks Contractors; 2012-10-16 to current/open; source msha-controller-operator-history