# Relationship history for MSHA mine 1514331

Current hierarchy: **Palmer Andy → Blackfire Coal Company → Job #1**

- 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:** Palmer Andy → Job #1; 1983-07-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blackfire Coal Company → Job #1; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Palmer Andy → Blackfire Coal Company; 1983-11-01 to current/open; source msha-controller-operator-history