# Relationship history for MSHA mine 3609768

Current hierarchy: **Rodney A Birchard → NORTHEAST STONE WORKS, INC. → ORCHARD QUARRY #4**

- 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 → ORCHARD QUARRY #4; 2001-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northeast Stone Works, Inc. → ORCHARD QUARRY #4; 2009-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney A Birchard → Northeast Stone Works, Inc.; 2009-06-15 to current/open; source msha-controller-operator-history