# Relationship history for MSHA mine 1601271

Current hierarchy: **Hazel T  Cowan → J K Cowan Sr Contracting Company Inc → COWAN DIRT PIT #3**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hazel T  Cowan → COWAN DIRT PIT #3; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J K Cowan Sr Contracting Company Inc → COWAN DIRT PIT #3; 1994-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hazel T  Cowan → J K Cowan Sr Contracting Company Inc; 1994-04-01 to current/open; source msha-controller-operator-history