# Relationship history for MSHA mine 4605696

Current hierarchy: **Gibson Loretta & Kendall Mounts → Blue Bird Coal Company Inc → No 4**

- 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

- **controller_controls_mine:** Brown Charles E → No 4; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mack Coal Company Inc → No 4; 1977-12-01 to 1984-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Brown Charles E → Mack Coal Company Inc; 1977-12-01 to 1984-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Gibson Loretta & Kendall Mounts → No 4; 1983-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Deer Creek Energy Inc → No 4; 1984-05-30 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Compton Lucky D → No 4; 1984-05-30 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Compton Lucky D → Deer Creek Energy Inc; 1984-05-30 to 1985-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Blue Bird Coal Company Inc → No 4; 1985-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gibson Loretta & Kendall Mounts → Blue Bird Coal Company Inc; 1985-09-17 to current/open; source msha-controller-operator-history