# Relationship history for MSHA mine 2302245

Current hierarchy: **Rex  Carlson → C & C Rock Quarry → C & C Rock 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:** American U S Aggregate → C & C Rock Quarry; 2001-07-01 to 2008-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Floyd  Waller  et al → C & C Rock Quarry; 2001-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Floyd  Waller  et al → American U S Aggregate; 2001-07-01 to 2008-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Carlson  et al → American U S Aggregate; 2001-07-01 to 2008-02-26; source msha-controller-operator-history
- **operator_operates_mine:** C & C Rock Quarry → C & C Rock Quarry; 2008-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rex  Carlson → C & C Rock Quarry; 2008-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Carlson → C & C Rock Quarry; 2008-02-27 to current/open; source msha-controller-operator-history