# Relationship history for MSHA mine 3609806

Current hierarchy: **Richard D  Phillips → J & R Excavating → J & R Excavating**

- 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

- **controller_controls_mine:** Richard D  Phillips → J & R Excavating; 2007-06-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & R Excavating → J & R Excavating; 2009-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard D  Phillips → J & R Excavating; 2009-10-30 to current/open; source msha-controller-operator-history