# Relationship history for MSHA mine 2401910

Current hierarchy: **CRH PLC → Blahnik Construction Inc → Blahnik Portable**

- 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:** Blahnik Construction Inc → Blahnik Portable; 1990-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blahnik John → Blahnik Portable; 1990-02-01 to 2003-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Blahnik John → Blahnik Construction Inc; 1990-02-01 to 2003-07-30; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Blahnik Portable; 2003-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Blahnik Construction Inc; 2003-08-01 to current/open; source msha-controller-operator-history