# Relationship history for MSHA mine 4001107

Current hierarchy: **Crabtree Darrell & Harvey--Billy Moon → Big Four Tipple → 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 1978-10-09; 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 1978-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Rich John W (Ky-Tn-In) → Kent Tipple; 1978-05-01 to 1982-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Energy Inc → Kent Tipple; 1978-10-10 to 1982-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Rich John W (Ky-Tn-In) → Energy Inc; 1978-10-10 to 1982-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Big Four Tipple → Kent Tipple; 1982-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crabtree Darrell & Harvey--Billy Moon → Kent Tipple; 1982-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crabtree Darrell & Harvey--Billy Moon → Big Four Tipple; 1982-08-26 to current/open; source msha-controller-operator-history