# Relationship history for MSHA mine 4702846

Current hierarchy: **Greg  Bruening → Bruening Rock Products → Chicken Ridge**

- 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:** Greg  Bruening → Chicken Ridge; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Burcalow → Chicken Ridge; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Yahara Materials Inc → Chicken Ridge; 1987-01-01 to 2017-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Burcalow → Yahara Materials Inc; 1987-01-01 to 2017-06-18; source msha-controller-operator-history
- **operator_operates_mine:** Nelson Rock Products → Chicken Ridge; 2017-06-19 to 2023-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Harlan Carl  Nelson → Chicken Ridge; 2017-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harlan Carl  Nelson → Nelson Rock Products; 2017-06-19 to 2023-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Bruening Rock Products → Chicken Ridge; 2023-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Bruening → Bruening Rock Products; 2023-03-02 to current/open; source msha-controller-operator-history