# Relationship history for MSHA mine 2902068

Current hierarchy: **Frank M  Batte; Karen G  Batte → Batte Enterprises → Pioneer Portable**

- 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:** Frank M  Batte  et al → Pioneer Portable; 1987-09-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Batte Enterprises → Pioneer Portable; 1991-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank M  Batte  et al → Batte Enterprises; 1991-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karen G  Batte  et al → Batte Enterprises; 1991-02-01 to current/open; source msha-controller-operator-history