# Relationship history for MSHA mine 4503695

Current hierarchy: **Ryan J  Costanti → Colony Sand & Gravel → Marblemount 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Colony Sand & Gravel → Marblemount Quarry; 2011-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ryan J  Costanti → Marblemount Quarry; 2011-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan J  Costanti → Colony Sand & Gravel; 2011-08-03 to current/open; source msha-controller-operator-history