# Relationship history for MSHA mine 4405757

Current hierarchy: **Owens Otto & Gordon → Owens Coal Company → Mine No 9**

- 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:** Owens Otto & Gordon Et Al → Mine No 9; 1975-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Owens Coal Company → Mine No 9; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owens Otto & Gordon Et Al → Owens Coal Company; 1981-09-01 to current/open; source msha-controller-operator-history