# Relationship history for MSHA mine 4502210

Current hierarchy: **Severy Roy → Carson Crushing Company Inc → Siouxon 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:** U S Forest Service → Siouxon Quarry; 1950-01-01 to 1981-05-11; source msha-controller-operator-history
- **controller_controls_mine:** United States Government → Siouxon Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Forest Service; 1950-01-01 to 1981-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Carson Crushing Company Inc → Siouxon Quarry; 1981-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Severy Roy → Siouxon Quarry; 1981-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Severy Roy → Carson Crushing Company Inc; 1981-05-12 to current/open; source msha-controller-operator-history