# Relationship history for MSHA mine 2104064

Current hierarchy: **Jerry  Kobliska; Jeff  Kobliska → Ideal Construction → Allis Chalmers  6'by20' Screen**

- 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:** Ideal Construction → Allis Chalmers  6'by20' Screen; 2024-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Kobliska et al → Allis Chalmers  6'by20' Screen; 2024-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Kobliska et al → Ideal Construction; 2024-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Kobliska et al → Ideal Construction; 2024-03-06 to current/open; source msha-controller-operator-history