# Relationship history for MSHA mine 4702857

Current hierarchy: **Shirley  Rademann → Oakfield Stone Company, Inc. → Fond du Lac**

- 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

- **controller_controls_mine:** Bruce  Rademann → Fond du Lac; 1950-01-01 to 2017-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Oakfield Stone Company Inc → Fond du Lac; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Rademann → Oakfield Stone Company Inc; 1987-03-01 to 2017-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Shirley  Rademann → Fond du Lac; 2017-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shirley  Rademann → Oakfield Stone Company Inc; 2017-08-26 to current/open; source msha-controller-operator-history