# Relationship history for MSHA mine 4603444

Current hierarchy: **James C  Justice III → Keystone Service Industries, Inc. → Keystone No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Eastern Gas & Fuel Association → Keystone No 1 Preparation Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Associated Coal Corp → Keystone No 1 Preparation Plant; 1972-06-01 to 1987-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Eastern Gas & Fuel Association → Eastern Associated Coal Corp; 1972-06-01 to 1987-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Keystone No 1 Preparation Plant; 1987-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Associated Coal Corp → Keystone No 1 Preparation Plant; 1987-05-15 to 1987-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Eastern Associated Coal Corp; 1987-05-15 to 1987-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Keystone Service Industries Inc → Keystone No 1 Preparation Plant; 1987-08-18 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_mine:** James C  Justice II et al → Keystone No 1 Preparation Plant; 1987-08-18 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice II et al → Keystone Service Industries Inc; 1987-08-18 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Mechel Oao → Keystone No 1 Preparation Plant; 2009-05-07 to 2015-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Mechel Oao → Keystone Service Industries Inc; 2009-05-07 to 2009-05-06; source msha-controller-operator-history
- **operator_operates_mine:** Second Sterling Corp. → Keystone No 1 Preparation Plant; 2009-05-07 to 2010-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Mechel Oao → Keystone No 1 Preparation Plant; 2009-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mechel Oao → Second Sterling Corp.; 2009-05-07 to 2010-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Keystone Service Industries, Inc. → Keystone No 1 Preparation Plant; 2010-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mechel Oao → Keystone Service Industries, Inc.; 2010-08-01 to 2015-02-11; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice II et al → Keystone Service Industries, Inc.; 2010-08-01 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_mine:** James C  Justice II et al → Keystone No 1 Preparation Plant; 2015-02-12 to 2017-05-14; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice II et al → Keystone Service Industries Inc; 2015-02-12 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice II et al → Keystone Service Industries, Inc.; 2015-02-12 to 2017-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Jillean L  Justice et al → Keystone No 1 Preparation Plant; 2017-05-15 to 2022-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Jillean L  Justice et al → Keystone Service Industries Inc; 2017-05-15 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice lll et al → Keystone Service Industries Inc; 2017-05-15 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_operator:** Jillean L  Justice et al → Keystone Service Industries, Inc.; 2017-05-15 to 2022-08-23; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice lll et al → Keystone Service Industries, Inc.; 2017-05-15 to 2022-08-23; source msha-controller-operator-history
- **controller_controls_mine:** James C  Justice III → Keystone No 1 Preparation Plant; 2022-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice III → Keystone Service Industries Inc; 2022-08-24 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice III → Keystone Service Industries, Inc.; 2022-08-24 to current/open; source msha-controller-operator-history