# Relationship history for MSHA mine 4405717

Current hierarchy: **Gary A  Horn → Misty-Bec Coal Corp → Misty-Bec 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:** Fleetwood Coal Company Inc → Misty-Bec No 1; 1981-08-01 to 1986-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Mc Cowan Buddy Et Al → Misty-Bec No 1; 1981-08-01 to 1986-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cowan Buddy Et Al → Fleetwood Coal Company Inc; 1981-08-01 to 1986-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Misty-Bec Coal Corp → Misty-Bec No 1; 1986-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary A  Horn → Misty-Bec No 1; 1986-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Horn → Misty-Bec Coal Corp; 1986-02-10 to current/open; source msha-controller-operator-history