# Relationship history for MSHA mine 4404813

Current hierarchy: **Boyd Leon → Six B Coal Company → No 3**

- 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

- **controller_controls_mine:** Looney Kendall W → No 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boyd Leon → No 3; 1974-07-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Looney Coal Company → No 3; 1977-08-01 to 1980-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Looney Kendall W → Looney Coal Company; 1977-08-01 to 1980-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Six B Coal Company → No 3; 1980-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boyd Leon → Six B Coal Company; 1980-05-16 to current/open; source msha-controller-operator-history