# Relationship history for MSHA mine 0404445

Current hierarchy: **Hurns Paul → Paul Hurns Construction → Dam Sand Plant**

- 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:** Paul Hurns Construction → Dam Sand Plant; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hurns Paul → Dam Sand Plant; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hurns Paul → Paul Hurns Construction; 1980-07-01 to current/open; source msha-controller-operator-history