# Relationship history for MSHA mine 1401537

Current hierarchy: **Warren W  Harshman → Harshman Construction L L C → PLANT 2**

- 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 2; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harshman Construction L L C → PLANT 2; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren W  Harshman et al → Harshman Construction L L C; 1990-05-01 to current/open; source msha-controller-operator-history