# Relationship history for MSHA mine 1510012

Current hierarchy: **Ashland Inc → Kentucky King Coal Inc → Short River Dock**

- 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:** Ashland Inc et al → Short River Dock; 1975-03-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky King Coal Inc → Short River Dock; 1976-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Kentucky King Coal Inc; 1976-09-15 to current/open; source msha-controller-operator-history