# Relationship history for MSHA mine 3503634

Current hierarchy: **Rod  Anderson → Rod Anderson Construction, Inc. → Barnhart Quarry**

- 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:** Rod  Anderson → Barnhart Quarry; 1992-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Barnhart Rock Inc → Barnhart Quarry; 2006-04-03 to 2007-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Rod  Anderson → Barnhart Rock Inc; 2006-04-03 to 2007-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Rod Anderson Construction, Inc. → Barnhart Quarry; 2007-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rod  Anderson → Barnhart Quarry; 2007-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rod  Anderson → Rod Anderson Construction, Inc.; 2007-08-15 to current/open; source msha-controller-operator-history