# Relationship history for MSHA mine 4702779

Current hierarchy: **Luffel Dan → 6-L Company → Ruby Red Quarry**

- 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:** 6-L Company → Ruby Red Quarry; 1984-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Luffel Dan → Ruby Red Quarry; 1984-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Luffel Dan → 6-L Company; 1984-11-01 to current/open; source msha-controller-operator-history