# Relationship history for MSHA mine 4601535

Current hierarchy: **Ernest E  Varney → Panther Colliers Inc → Keystone #2**

- 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:** Kennie Ray  Childers → Keystone #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Associated Coal Corp → Keystone #2; 1950-01-01 to 1986-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Eastern Gas & Fuel Association → Keystone #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eastern Gas & Fuel Association → Eastern Associated Coal Corp; 1950-01-01 to 1986-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Genoa Coal Company Inc → Keystone #2; 1986-08-21 to 1987-09-10; source msha-controller-operator-history
- **controller_controls_operator:** Kennie Ray  Childers → Genoa Coal Company Inc; 1986-08-21 to 1987-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Benafuels Inc → Keystone #2; 1987-09-11 to 1990-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Bruce R  Davis → Keystone #2; 1987-09-11 to 1990-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Bruce R  Davis → Benafuels Inc; 1987-09-11 to 1990-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Herndon Enterprises Inc → Keystone #2; 1990-10-01 to 1991-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Wallen David → Keystone #2; 1990-10-01 to 1991-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Wallen David → Herndon Enterprises Inc; 1990-10-01 to 1991-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Panther Colliers Inc → Keystone #2; 1991-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ernest E  Varney et al → Keystone #2; 1991-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernest E  Varney et al → Panther Colliers Inc; 1991-01-15 to current/open; source msha-controller-operator-history