# Relationship history for MSHA mine 0405718

Current hierarchy: **Jeff C  Halloran → Wyroc Materials Inc → Wyroc Apple Valley**

- 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:** Wyroc Materials Inc → Wyroc Apple Valley; 2007-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeff C  Halloran → Wyroc Apple Valley; 2007-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff C  Halloran → Wyroc Materials Inc; 2007-04-04 to current/open; source msha-controller-operator-history