# Relationship history for MSHA mine 2601585

Current hierarchy: **Messer Luvon → Rook & Messer Excavating Company → Green Ash 2**

- 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:** Messer Luvon → Green Ash 2; 1979-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rook & Messer Excavating Company → Green Ash 2; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Messer Luvon → Rook & Messer Excavating Company; 1980-02-01 to current/open; source msha-controller-operator-history