# Relationship history for MSHA mine 1510626

Current hierarchy: **Vanover Danny → Black Diamond Coal Company → No 1 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

- **controller_controls_mine:** Combs Herman Jr → No 1 Tipple; 1975-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big H Combs Coal Company Inc → No 1 Tipple; 1977-07-01 to 1980-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Combs Herman Jr → Big H Combs Coal Company Inc; 1977-07-01 to 1980-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Black Diamond Coal Company → No 1 Tipple; 1980-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vanover Danny → No 1 Tipple; 1980-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vanover Danny → Black Diamond Coal Company; 1980-10-08 to current/open; source msha-controller-operator-history