# Relationship history for MSHA mine 4000953

Current hierarchy: **Appleby Edd → Whistle Creek Coal Company Inc → Kent Tipple**

- 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:** Blair Fork Coal Company → Kent Tipple; 1950-01-01 to 1977-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Blue Diamond Coal Company → Kent Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blue Diamond Coal Company → Blair Fork Coal Company; 1950-01-01 to 1977-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Appleby Edd → Kent Tipple; 1977-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Whistle Creek Coal Company Inc → Kent Tipple; 1977-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Appleby Edd → Whistle Creek Coal Company Inc; 1977-10-02 to current/open; source msha-controller-operator-history