# Relationship history for MSHA mine 3800718

Current hierarchy: **Harvey R  Coffin → H R Coffin & Sons LLC → H R Coffin & Sons LLC**

- 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:** H R Coffin & Sons LLC → H R Coffin & Sons LLC; 2008-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harvey R  Coffin → H R Coffin & Sons LLC; 2008-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harvey R  Coffin → H R Coffin & Sons LLC; 2008-01-17 to current/open; source msha-controller-operator-history