# Relationship history for MSHA mine 3401894

Current hierarchy: **Rick D  Bumpers → Blue Creek Stone Inc → Blocker #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

- **operator_operates_mine:** Blue Creek Stone Inc → Blocker #1; 2002-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rick D  Bumpers → Blocker #1; 2002-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick D  Bumpers → Blue Creek Stone Inc; 2002-10-12 to current/open; source msha-controller-operator-history