# Relationship history for MSHA mine 3402099

Current hierarchy: **Raymond B Morton; Mitchell  Morton → Morton Materials → Morton Mine Site 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Nowata County-OK → Morton Mine Site 1; 2000-12-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Nowata County → Morton Mine Site 1; 2009-12-16 to 2020-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Nowata County-OK → Nowata County; 2009-12-16 to 2020-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Morton Materials → Morton Mine Site 1; 2020-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond B Morton et al → Morton Mine Site 1; 2020-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond B Morton et al → Morton Materials; 2020-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell  Morton et al → Morton Materials; 2020-07-21 to current/open; source msha-controller-operator-history