# Relationship history for MSHA mine 0504845

Current hierarchy: **Norbie  Larsen → Larson Colorado LLC → Byzantine 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:** High Country Pipeline → Byzantine Quarry; 2006-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Norbie  Larsen → Byzantine Quarry; 2006-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norbie  Larsen → High Country Pipeline; 2006-05-23 to current/open; source msha-controller-operator-history