# Relationship history for MSHA mine 1507907

Current hierarchy: **Randall K Taylor; Ryan  Johns; Todd  Case → NorthStar Operating Company, LLC → Huff Preparation Plant**

- 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:** Canada Coal Company Inc → Huff Preparation Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Canada Coal Company Inc → Huff Preparation Plant; 1974-01-01 to 1992-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Canada Coal Company Inc → Canada Coal Company Inc; 1974-01-01 to 1992-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Berwind Corporation → Huff Preparation Plant; 1981-11-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jesse Branch Coal Company → Huff Preparation Plant; 1992-11-19 to 1997-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Berwind Corporation → Jesse Branch Coal Company; 1992-11-19 to 1997-09-07; source msha-controller-operator-history
- **controller_controls_mine:** John  Harris → Huff Preparation Plant; 1995-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Berkeley Energy Corp → Huff Preparation Plant; 1997-09-08 to 2021-05-02; source msha-controller-operator-history
- **controller_controls_operator:** John  Harris → Berkeley Energy Corp; 1997-09-08 to 2021-05-02; source msha-controller-operator-history
- **operator_operates_mine:** NORTHSTAR SUSTAINABLE ENERGY LLC → Huff Preparation Plant; 2021-05-03 to 2022-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Ryan  Johns → Huff Preparation Plant; 2021-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Johns → NORTHSTAR SUSTAINABLE ENERGY LLC; 2021-05-03 to 2022-03-22; source msha-controller-operator-history
- **operator_operates_mine:** NorthStar Operating Company, LLC → Huff Preparation Plant; 2022-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ryan  Johns et al → Huff Preparation Plant; 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
- **controller_controls_operator:** Randall K Taylor et al → NorthStar Operating Company, LLC; 2022-03-23 to current/open; source msha-controller-operator-history