# Relationship history for MSHA mine 1601391

Current hierarchy: **Hazel T  Cowan → J. K. Cowan Sr. Contracting Co., Inc. → Cowan Dirt Pit # 4**

- 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:** Hazel T  Cowan → Cowan Dirt Pit # 4; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J. K. Cowan Sr. Contracting Co., Inc. → Cowan Dirt Pit # 4; 2002-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hazel T  Cowan → J. K. Cowan Sr. Contracting Co., Inc.; 2002-01-24 to current/open; source msha-controller-operator-history