# Relationship history for MSHA mine 0405531

Current hierarchy: **Jeff C  Halloran → Wyroc Inc → Wyroc Norco**

- 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

- **controller_controls_mine:** Jeff C  Halloran → Wyroc Norco; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wyroc Inc → Wyroc Norco; 2002-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff C  Halloran → Wyroc Inc; 2002-08-20 to current/open; source msha-controller-operator-history