# Relationship history for MSHA mine 1510226

Current hierarchy: **Great Western Resources Inc → Harlan Fuel Company → Nolansburg Prep 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:** Swartwood T Marshall → Nolansburg Prep Plant; 1976-01-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S O Coal Company Inc → Nolansburg Prep Plant; 1977-01-01 to 1978-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Swartwood T Marshall → S O Coal Company Inc; 1977-01-01 to 1978-09-18; source msha-controller-operator-history
- **operator_operates_mine:** J & T Coal Company → Nolansburg Prep Plant; 1978-09-19 to 1978-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Joe E → Nolansburg Prep Plant; 1978-09-19 to 1978-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Joe E → J & T Coal Company; 1978-09-19 to 1978-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Harlan County Steam & Stoker Inc → Nolansburg Prep Plant; 1978-11-14 to 1982-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Burchett Delbert → Nolansburg Prep Plant; 1978-11-14 to 1982-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Burchett Delbert → Harlan County Steam & Stoker Inc; 1978-11-14 to 1982-02-24; source msha-controller-operator-history
- **operator_operates_mine:** M & P Coal Company → Nolansburg Prep Plant; 1982-02-25 to 1983-11-27; source msha-controller-operator-history
- **controller_controls_mine:** Pate Carl & Charles Mc Nulty → Nolansburg Prep Plant; 1982-02-25 to 1983-11-27; source msha-controller-operator-history
- **controller_controls_operator:** Pate Carl & Charles Mc Nulty → M & P Coal Company; 1982-02-25 to 1983-11-27; source msha-controller-operator-history
- **operator_operates_mine:** Harlan County Steam & Stoker Inc → Nolansburg Prep Plant; 1983-11-28 to 1993-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Robinson John → Nolansburg Prep Plant; 1983-11-28 to 1993-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Robinson John → Harlan County Steam & Stoker Inc; 1983-11-28 to 1993-02-04; source msha-controller-operator-history
- **controller_controls_mine:** Great Western Resources Inc → Nolansburg Prep Plant; 1987-02-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harlan Fuel Company → Nolansburg Prep Plant; 1993-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Great Western Resources Inc → Harlan Fuel Company; 1993-02-05 to current/open; source msha-controller-operator-history