# Relationship history for MSHA mine 4503307

Current hierarchy: **Netta E  Groat → Circle C Rock Products → Circle C Rock Products**

- 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:** Circle C Rock Products → Circle C Rock Products; 1993-09-01 to 1999-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Caren  Carlson → Circle C Rock Products; 1993-09-01 to 1999-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Caren  Carlson → Circle C Rock Products; 1993-09-01 to 1999-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Circle C Rock Products → Circle C Rock Products; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Netta E  Groat → Circle C Rock Products; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Netta E  Groat → Circle C Rock Products; 1999-02-01 to current/open; source msha-controller-operator-history