# Relationship history for MSHA mine 0503052

Current hierarchy: **Mendisco Felix → F & F Mendisco Mining Company → Last Chance**

- 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:** Mendisco Felix → Last Chance; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Williams Inc → Last Chance; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Williams W R → Last Chance; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams W R → Williams Inc; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **operator_operates_mine:** F & F Mendisco Mining Company → Last Chance; 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mendisco Felix → F & F Mendisco Mining Company; 1981-02-01 to current/open; source msha-controller-operator-history