# Relationship history for MSHA mine 4202316

Current hierarchy: **Alvin F  Cobabe → Elkhorn Limited Partner → 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

- **operator_operates_mine:** Elkhorn Limited Partner → PORTABLE CRUSHER; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alvin F  Cobabe  et al → PORTABLE CRUSHER; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alvin F  Cobabe  et al → Elkhorn Limited Partner; 2001-04-01 to current/open; source msha-controller-operator-history