# Relationship history for MSHA mine 1102948

Current hierarchy: **Ashland Inc → Arch Of Illinois → Arch Of Illinois Preparation 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Ashland Inc et al → Arch Of Illinois Preparation Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arch Of Illinois → Arch Of Illinois Preparation Plant; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Arch Of Illinois; 1993-09-01 to current/open; source msha-controller-operator-history