# Relationship history for MSHA mine 3606314

Current hierarchy: **Urmann John M → Valley Coal & Supply Inc → Valley 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Valley Coal & Supply Inc → Valley Preparation Plant; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Urmann John M → Valley Preparation Plant; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Urmann John M → Valley Coal & Supply Inc; 1977-01-01 to current/open; source msha-controller-operator-history