# Relationship history for MSHA mine 3606864

Current hierarchy: **Swistock Peter Jr → Mustang Coal & Contracting Corp → Wood Operation**

- 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:** Mustang Coal & Contracting Corp → Wood Operation; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Swistock Peter Jr → Wood Operation; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Swistock Peter Jr → Mustang Coal & Contracting Corp; 1979-07-01 to current/open; source msha-controller-operator-history