# Relationship history for MSHA mine 4200768

Current hierarchy: **Shumway Gary → Western Key Enterprise → Small Fry**

- 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:** Hecla Mining Company → Small Fry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B Mining Company → Small Fry; 1950-01-01 to 1984-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Ranchers Exploration & Development Corp → Small Fry; 1950-01-01 to 1984-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Ranchers Exploration & Development Corp → B Mining Company; 1950-01-01 to 1984-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Shumway Gary → Small Fry; 1982-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hecla Mining Company → Small Fry; 1984-07-26 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Hecla Mining Company → Hecla Mining Company; 1984-07-26 to 1986-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Western Key Enterprise → Small Fry; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shumway Gary → Western Key Enterprise; 1986-05-01 to current/open; source msha-controller-operator-history