# Relationship history for MSHA mine 0405779

Current hierarchy: **Teichert Inc → Santa Fe Aggregates, Inc. → Santa Fe Aggregates 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:** Douglas E  Raisch → Santa Fe Aggregates Portable; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Teichert Inc → Santa Fe Aggregates Portable; 1988-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Raisch Products → Santa Fe Aggregates Portable; 2009-02-26 to 2010-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Douglas E  Raisch → Raisch Products; 2009-02-26 to 2010-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Santa Fe Aggregates, Inc. → Santa Fe Aggregates Portable; 2010-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Teichert Inc → Santa Fe Aggregates, Inc.; 2010-05-06 to current/open; source msha-controller-operator-history