# Relationship history for MSHA mine 2501189

Current hierarchy: **Ronald L  Follmer → Mid-Nebraska Aggregate Inc. → Alda Pit**

- 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:** Jim R  Bruner  et al → Alda Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bruners Sand & Gravel Inc → Alda Pit; 1999-04-01 to 2003-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Jim R  Bruner  et al → Bruners Sand & Gravel Inc; 1999-04-01 to 2003-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Richard S  Bruner  et al → Bruners Sand & Gravel Inc; 1999-04-01 to 2003-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Ronald L  Follmer et al → Alda Pit; 2000-05-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Nebraska Aggregate Inc. → Alda Pit; 2003-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald L  Follmer et al → Mid-Nebraska Aggregate Inc.; 2003-02-11 to current/open; source msha-controller-operator-history