# Relationship history for MSHA mine 2602477

Current hierarchy: **Danny  Cooper → Cooper & Sons, Inc → 75-102 Eljay Portable Crusher**

- 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:** Danny  Cooper  et al → 75-102 Eljay Portable Crusher; 1991-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cooper & Sons, Inc → 75-102 Eljay Portable Crusher; 2002-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Danny  Cooper  et al → Cooper & Sons, Inc; 2002-06-17 to current/open; source msha-controller-operator-history