# Relationship history for MSHA mine 4405520

Current hierarchy: **Willard Franklin → Topa Inc → Surface #1**

- 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:** Francisco Gary & Mervin Casey → Surface #1; 1980-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & F Coal Company → Surface #1; 1980-10-01 to 1981-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Francisco Gary & Mervin Casey → C & F Coal Company; 1980-10-01 to 1981-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Topa Inc → Surface #1; 1981-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Willard Franklin → Surface #1; 1981-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willard Franklin → Topa Inc; 1981-06-03 to current/open; source msha-controller-operator-history