# Relationship history for MSHA mine 0900342

Current hierarchy: **Bledsoe James A → W M Bledsoe Company Inc → Wilburn**

- 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:** American Cyanamid Company → Wilburn; 1950-01-01 to 1988-05-08; source msha-controller-operator-history
- **controller_controls_mine:** American Cyanamid Company → Wilburn; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** American Cyanamid Company → American Cyanamid Company; 1950-01-01 to 1988-05-08; source msha-controller-operator-history
- **operator_operates_mine:** W M Bledsoe Company Inc → Wilburn; 1988-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bledsoe James A → Wilburn; 1988-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bledsoe James A → W M Bledsoe Company Inc; 1988-05-09 to current/open; source msha-controller-operator-history