# Relationship history for MSHA mine 1507933

Current hierarchy: **Owen George W → George W Owen → No 1 Surface**

- 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:** A & W Coal Company Inc → No 1 Surface; 1974-01-01 to 1975-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Robert Day → No 1 Surface; 1974-01-01 to 1975-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Robert Day → A & W Coal Company Inc; 1974-01-01 to 1975-02-01; source msha-controller-operator-history
- **operator_operates_mine:** George W Owen → No 1 Surface; 1975-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Owen George W → No 1 Surface; 1975-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owen George W → George W Owen; 1975-02-02 to current/open; source msha-controller-operator-history