# Relationship history for MSHA mine 4405459

Current hierarchy: **Sutherland Kermit R → Sutherland Coal 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

- **controller_controls_mine:** Mitchell George & Billy Et Al → No 1; 1978-09-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple M Coal Company → No 1; 1980-07-01 to 1981-02-03; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell George & Billy Et Al → Triple M Coal Company; 1980-07-01 to 1981-02-03; source msha-controller-operator-history
- **operator_operates_mine:** Sutherland Coal Company → No 1; 1981-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sutherland Kermit R → No 1; 1981-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sutherland Kermit R → Sutherland Coal Company; 1981-02-04 to current/open; source msha-controller-operator-history