# Relationship history for MSHA mine 4703627

Current hierarchy: **ISA Operating Company LLC → COMPLETION INDUSTRIAL MINERALS, LLC. → MARSHFIELD 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:** Completion Industrial Minerals, LLC → MARSHFIELD PLANT; 2011-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** ISA Operating Company LLC et al → MARSHFIELD PLANT; 2011-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ISA Operating Company LLC et al → Completion Industrial Minerals, LLC; 2011-10-25 to current/open; source msha-controller-operator-history