# Relationship history for MSHA mine 3607094

Current hierarchy: **Shingara Stephen Jr & Matt L--Keith R Reader → Virgin Coal Company → No 1 Slope**

- 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:** Virgin Coal Company → No 1 Slope; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shingara Stephen Jr & Matt L--Keith R Reader → No 1 Slope; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shingara Stephen Jr & Matt L--Keith R Reader → Virgin Coal Company; 1981-03-01 to current/open; source msha-controller-operator-history