# Relationship history for MSHA mine 1518022

Current hierarchy: **James River Coal Company → Blue Diamond Coal Company → #74**

- 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:** Blue Diamond Coal Company → #74; 1998-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → #74; 1998-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Blue Diamond Coal Company; 1998-02-01 to current/open; source msha-controller-operator-history