# Relationship history for MSHA mine 1514668

Current hierarchy: **Lee James & Burdett Kretzer → Rock Fork Mining Company → No 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

- **operator_operates_mine:** Central States Coal Company Ltd → No 1; 1984-06-01 to 1985-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Hazen Howard → No 1; 1984-06-01 to 1985-07-02; source msha-controller-operator-history
- **controller_controls_operator:** Hazen Howard → Central States Coal Company Ltd; 1984-06-01 to 1985-07-02; source msha-controller-operator-history
- **operator_operates_mine:** Rock Fork Mining Company → No 1; 1985-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lee James & Burdett Kretzer → No 1; 1985-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee James & Burdett Kretzer → Rock Fork Mining Company; 1985-07-03 to current/open; source msha-controller-operator-history