# Relationship history for MSHA mine 4607581

Current hierarchy: **James B  Simpkins → Cow Creek Coal Company Inc → No 8**

- 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:** Cow Creek Mining Company → No 8; 1988-09-01 to 1991-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Brown Eugene → No 8; 1988-09-01 to 1991-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Brown Eugene → Cow Creek Mining Company; 1988-09-01 to 1991-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Cow Creek Coal Company Inc → No 8; 1991-03-26 to 1991-09-10; source msha-controller-operator-history
- **controller_controls_mine:** James B  Simpkins → No 8; 1991-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James B  Simpkins → Cow Creek Coal Company Inc; 1991-03-26 to 1991-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Hi-Co Energy Inc → No 8; 1991-09-11 to 1995-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Jack G - Charles Carpenter Et Al → No 8; 1991-09-11 to 1995-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Jack G - Charles Carpenter Et Al → Hi-Co Energy Inc; 1991-09-11 to 1995-03-09; source msha-controller-operator-history
- **operator_operates_mine:** Cow Creek Coal Company Inc → No 8; 1995-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James B  Simpkins → Cow Creek Coal Company Inc; 1995-03-10 to current/open; source msha-controller-operator-history