# Relationship history for MSHA mine 1601450

Current hierarchy: **Phoenix Associates Land Syndicate → Murphy's Sand & Gravel → Murphy's Sand & Gravel**

- 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:** Murphy's Sand & Gravel → Murphy's Sand & Gravel; 2007-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phoenix Associates Land Syndicate → Murphy's Sand & Gravel; 2007-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phoenix Associates Land Syndicate → Murphy's Sand & Gravel; 2007-01-24 to current/open; source msha-controller-operator-history