# Relationship history for MSHA mine 3003565

Current hierarchy: **Constantinos G Stefanou → Gus's Bluestone → Gus's 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

- **operator_operates_mine:** Koch Bluestone → Gus's Quarry; 2006-10-09 to 2008-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard J  Koch → Gus's Quarry; 2006-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard J  Koch → Koch Bluestone; 2006-10-09 to 2008-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Gus's Bluestone → Gus's Quarry; 2008-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Constantinos G Stefanou → Gus's Quarry; 2008-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Constantinos G Stefanou → Gus's Bluestone; 2008-08-01 to current/open; source msha-controller-operator-history