# Relationship history for MSHA mine 4503304

Current hierarchy: **Rosalyn  Erickson → Hawk's Superior Rock → Hawks Superior Rock**

- 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:** Hawks Superior Rock Inc → Hawks Superior Rock; 1993-08-01 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Runyon → Hawks Superior Rock; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Runyon → Hawks Superior Rock Inc; 1993-08-01 to 2018-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Hawk's Superior Rock → Hawks Superior Rock; 2019-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rosalyn  Erickson → Hawks Superior Rock; 2019-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rosalyn  Erickson → Hawk's Superior Rock; 2019-01-01 to current/open; source msha-controller-operator-history