# Relationship history for MSHA mine 4406533

Current hierarchy: **Gary A  Horn → Buchanan Production Company → No 1**

- 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:** Dixie Mining Company Inc → No 1; 1989-08-01 to 1991-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Sam  Blankenship → No 1; 1989-08-01 to 1991-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Sam  Blankenship → Dixie Mining Company Inc; 1989-08-01 to 1991-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Buchanan Production Company → No 1; 1991-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary A  Horn → No 1; 1991-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Horn → Buchanan Production Company; 1991-07-11 to current/open; source msha-controller-operator-history