# Relationship history for MSHA mine 4105605

Current hierarchy: **David D  Gray → Halligan Services LLC → Hawley Sand and 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Halligan Services LLC → Hawley Sand and Gravel; 2022-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David D  Gray → Hawley Sand and Gravel; 2022-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David D  Gray → Halligan Services LLC; 2022-02-11 to current/open; source msha-controller-operator-history