# Relationship history for MSHA mine 1001963

Current hierarchy: **Geraldine R  Hansen → The Rock Works Mining Inc → Rams Horn**

- 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:** Rock Works → Rams Horn; 1999-08-01 to 2003-05-05; source msha-controller-operator-history
- **controller_controls_mine:** R Kirk  Hansen → Rams Horn; 1999-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R Kirk  Hansen → Rock Works; 1999-08-01 to 2003-05-05; source msha-controller-operator-history
- **controller_controls_mine:** R Kirk  Hansen → Rams Horn; 2001-11-28 to 2016-02-25; source msha-controller-operator-history
- **operator_operates_mine:** The Rock Works Mining Inc → Rams Horn; 2003-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R Kirk  Hansen → The Rock Works Mining Inc; 2003-05-06 to 2016-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Geraldine R  Hansen → Rams Horn; 2016-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geraldine R  Hansen → The Rock Works Mining Inc; 2016-02-26 to current/open; source msha-controller-operator-history