# Relationship history for MSHA mine 1510693

Current hierarchy: **Combs Herman Jr → Big H Combs Coal Company Inc → No 14 Mine**

- 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 14 Mine; 1975-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big H Combs Coal Company Inc → No 14 Mine; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Combs Herman Jr → Big H Combs Coal Company Inc; 1977-08-01 to current/open; source msha-controller-operator-history