# Relationship history for MSHA mine 0500290

Current hierarchy: **Layton W D → G E C Minerals Inc → Gec Strip And Auger**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Corley Company → Gec Strip And Auger; 1950-01-01 to 1973-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Corley W D Jr → Gec Strip And Auger; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corley W D Jr → Corley Company; 1950-01-01 to 1973-03-09; source msha-controller-operator-history
- **operator_operates_mine:** Canon Coal Corp → Gec Strip And Auger; 1973-03-10 to 1976-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Weckerling Harry → Gec Strip And Auger; 1973-03-10 to 1976-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Weckerling Harry → Canon Coal Corp; 1973-03-10 to 1976-03-26; source msha-controller-operator-history
- **operator_operates_mine:** G E C Minerals Inc → Gec Strip And Auger; 1976-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Layton W D → Gec Strip And Auger; 1976-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Layton W D → G E C Minerals Inc; 1976-03-27 to current/open; source msha-controller-operator-history