# Relationship history for MSHA mine 3609164

Current hierarchy: **Rodney A Birchard → Northeast Stone Works Inc → Quarry #2-Starzec**

- 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:** Rodney A Birchard → Quarry #2-Starzec; 2001-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northeast Stone Works Inc → Quarry #2-Starzec; 2003-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney A Birchard → Northeast Stone Works Inc; 2003-07-23 to current/open; source msha-controller-operator-history