# Relationship history for MSHA mine 1515933

Current hierarchy: **Deskins Jack D → Elkhorn Energies Inc → #3 Surface**

- 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:** Deskins Jack D → #3 Surface; 1984-06-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Elkhorn Energies Inc → #3 Surface; 1987-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deskins Jack D → Elkhorn Energies Inc; 1987-02-01 to current/open; source msha-controller-operator-history