# Relationship history for MSHA mine 1900979

Current hierarchy: **Bendix Corp → Bendix Abrasives Division → Plant No 6**

- 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:** Bendix Abrasives Division → Plant No 6; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bendix Corp → Plant No 6; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bendix Corp → Bendix Abrasives Division; 1980-02-01 to current/open; source msha-controller-operator-history