# Relationship history for MSHA mine 4603183

Current hierarchy: **Pittston Company → Kanawha Development Corp → Harewood Prep Plant/Refuse Area**

- 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

- **operator_operates_mine:** Allied Chemical Corp-Semet Solvay Div → Harewood Prep Plant/Refuse Area; 1950-01-01 to 1980-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Allied Chemical Corp → Harewood Prep Plant/Refuse Area; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allied Chemical Corp → Allied Chemical Corp-Semet Solvay Div; 1950-01-01 to 1980-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Armco Inc → Harewood Prep Plant/Refuse Area; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Harewood Prep Plant/Refuse Area; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Armco Inc → Harewood Prep Plant/Refuse Area; 1980-01-17 to 1984-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Armco Inc → Armco Inc; 1980-01-17 to 1984-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Peabody Coal Company → Harewood Prep Plant/Refuse Area; 1984-02-27 to 1988-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Peabody Coal Company; 1984-02-27 to 1988-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Imperial-Pacific Investments Inc → Harewood Prep Plant/Refuse Area; 1987-01-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hawks Nest Mining Company → Harewood Prep Plant/Refuse Area; 1988-11-16 to 1995-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Imperial-Pacific Investments Inc → Hawks Nest Mining Company; 1988-11-16 to 1995-03-16; source msha-controller-operator-history
- **operator_operates_mine:** Kanawha Development Corp → Harewood Prep Plant/Refuse Area; 1995-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → Harewood Prep Plant/Refuse Area; 1995-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Kanawha Development Corp; 1995-03-17 to current/open; source msha-controller-operator-history