# Relationship history for MSHA mine 3602810

Current hierarchy: **Van Dyke Bruce → Mt Braddock Land Company → Mt Braddock 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:** United States Steel Mining Company Inc → Mt Braddock Mine; 1950-01-01 to 1983-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Usx Corp → Mt Braddock Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Usx Corp → United States Steel Mining Company Inc; 1950-01-01 to 1983-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Mt Braddock Land Company → Mt Braddock Mine; 1983-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Van Dyke Bruce → Mt Braddock Mine; 1983-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Van Dyke Bruce → Mt Braddock Land Company; 1983-08-02 to current/open; source msha-controller-operator-history