# Relationship history for MSHA mine 3600662

Current hierarchy: **Quinn Theodore W → Quinn Coal & Clay Mines → West Branch**

- 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:** Quinn Coal Company → West Branch; 1950-01-01 to 1974-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Quinn Thomas W → West Branch; 1950-01-01 to 1974-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Quinn Thomas W → Quinn Coal Company; 1950-01-01 to 1974-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Peter M Evock → West Branch; 1974-10-31 to 1975-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Evock Peter M → West Branch; 1974-10-31 to 1975-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Evock Peter M → Peter M Evock; 1974-10-31 to 1975-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Quinn Coal & Clay Mines → West Branch; 1975-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quinn Theodore W → West Branch; 1975-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quinn Theodore W → Quinn Coal & Clay Mines; 1975-08-02 to current/open; source msha-controller-operator-history