# Relationship history for MSHA mine 4202165

Current hierarchy: **Ray C  Brown → Unico, Inc. → Bromide Mine**

- 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:** Kaibab Industries Inc → Bromide Mine; 1997-03-01 to 2003-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Whiting R Bruce → Bromide Mine; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Whiting R Bruce → Kaibab Industries Inc; 1997-03-01 to 2003-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Ray C  Brown → Bromide Mine; 1997-05-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Unico, Inc. → Bromide Mine; 2003-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray C  Brown → Unico, Inc.; 2003-07-24 to current/open; source msha-controller-operator-history