# Relationship history for MSHA mine 1401724

Current hierarchy: **Warren W  Harshman → Harshman Construction L.L.C. → Plant 6**

- 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:** Warren W  Harshman et al → Plant 6; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harshman Construction L.L.C. → Plant 6; 2010-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren W  Harshman et al → Harshman Construction L.L.C.; 2010-11-24 to current/open; source msha-controller-operator-history