# Relationship history for MSHA mine 1518453

Current hierarchy: **Randall K Taylor; Ryan  Johns; Todd  Case → NorthStar Operating Company, LLC → U.A. No. 2 Mine (Face Up)**

- 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:** John  Harris → U.A. No. 2 Mine (Face Up); 1995-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Berkeley Energy Corporation → U.A. No. 2 Mine (Face Up); 2001-10-09 to 2021-08-01; source msha-controller-operator-history
- **controller_controls_operator:** John  Harris → Berkeley Energy Corporation; 2001-10-09 to 2021-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Ryan  Johns → U.A. No. 2 Mine (Face Up); 2021-05-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northstar Sustainable Energy LLC → U.A. No. 2 Mine (Face Up); 2021-08-02 to 2022-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Johns → Northstar Sustainable Energy LLC; 2021-08-02 to 2022-03-22; source msha-controller-operator-history
- **operator_operates_mine:** NorthStar Operating Company, LLC → U.A. No. 2 Mine (Face Up); 2022-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randall K Taylor et al → U.A. No. 2 Mine (Face Up); 2022-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall K Taylor et al → NorthStar Operating Company, LLC; 2022-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Johns et al → NorthStar Operating Company, LLC; 2022-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Case et al → NorthStar Operating Company, LLC; 2022-03-23 to current/open; source msha-controller-operator-history