# Relationship history for MSHA mine 1519901

Current hierarchy: **Randall K Taylor; Ryan  Johns; Todd  Case → NorthStar Sustainable Energy, LLC → Glamorgan 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:** Ryan  Johns → Glamorgan 1; 2021-05-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northstar Sustainable Energy LLC → Glamorgan 1; 2021-05-19 to 2022-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Johns → Northstar Sustainable Energy LLC; 2021-05-19 to 2022-03-22; source msha-controller-operator-history
- **operator_operates_mine:** NorthStar Operating Company, LLC → Glamorgan 1; 2022-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Todd  Case et al → Glamorgan 1; 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
- **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