# Relationship history for MSHA mine 4607891

Current hierarchy: **Eddie  Hurley → Continuous Mining Company Inc → Mine N0 1**

- 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:** Brown Eugene → Mine N0 1; 1990-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cow Creek Coal Company → Mine N0 1; 1990-06-01 to 1990-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Brown Eugene → Cow Creek Coal Company; 1990-06-01 to 1990-07-24; source msha-controller-operator-history
- **operator_operates_mine:** South Branch Coal Company Inc → Mine N0 1; 1990-07-25 to 1991-02-24; source msha-controller-operator-history
- **controller_controls_mine:** James B  Simpkins → Mine N0 1; 1990-07-25 to 1991-02-24; source msha-controller-operator-history
- **controller_controls_operator:** James B  Simpkins → South Branch Coal Company Inc; 1990-07-25 to 1991-02-24; source msha-controller-operator-history
- **operator_operates_mine:** Continuous Mining Company Inc → Mine N0 1; 1991-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eddie  Hurley → Mine N0 1; 1991-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eddie  Hurley → Continuous Mining Company Inc; 1991-02-25 to current/open; source msha-controller-operator-history